1995 G320 W463 European Model, help with O2 Sensor (it has been removed)

[Stranchy]

New to this forum, and also new to the W463 so I have many items that I need some wisdom on. Thanks in advance
I recently acquired a 1995 W463 G320. The markings on the Motor Block say: 104 011 1601 (not sure if this is a 996 motor that I see talked about here)

My main question is that the car was imported from Georgia (the country) to Virginia, that's where it was purchased from. It now lives in California (yes a problem)

Once I had it in the air the Exhaust is a mess (to be sorted later), the main issue is that it has had for what ever reason the O2 sensor removed.

Potentially stupid questions to Follow:

1-Did the 95 Euro W463 in fact have an O2 sensor (I'm pretty sure yes for engine management)​

​

2- Does anyone have a wiring diagram that shows the O2 sensor so I can get to the ECU and see if I can trace wires out of it maybe they cut it off or just unplugged it and the connector still lives​

​

3-I did find a plug hanging in the area in the motor compartment passenger side, a weather pack looking connector. It is a Two wire connector​

​

4- was the factory O2 Sensor 2 wire​

I hope I can get some advice and or direction, Thank you.

 

[Stranchy]

Minor update, I found the connector for the O2 sensor coming out of the underside of the truck near the frame rail. It is a 4 pin so that answers one question. Do any of you have a picture of your Cat on a 95 euro model and where the O2 sensor mounts to the exhaust? if so that would really help. Also I am thinking that the Euro W463 G320 only has one cat. A picture would be awesome.
Thank you,

 

[gerryvz]

Yes, the 1995 HFM-based M104 G-wagen DID have an oxygen sensor from the factory. I can try to take a photo of my sensor and exhaust. My cat is completely toast, but externally it is fine. And yes, there is only one cat as I remember.

 

[Stranchy]

Yes, the 1995 HFM-based M104 G-wagen DID have an oxygen sensor from the factory. I can try to take a photo of my sensor and exhaust. My cat is completely toast, but externally it is fine. And yes, there is only one cat as I remember.

Gerryvz, that would help tons, If possible can you get a pic of the CAT and the O2 sensor location. One other quick question the markings on the Motor Block say: 104 011 1601 (not sure if this is a 996 motor that I see talked about here) is it?

Thanks again I'm in a up hill battle with it being a Euro model as I'm sure you know.

 

[Stranchy]

Yes, the 1995 HFM-based M104 G-wagen DID have an oxygen sensor from the factory. I can try to take a photo of my sensor and exhaust. My cat is completely toast, but externally it is fine. And yes, there is only one cat as I remember.

Gerryvz, any luck with a photo of your CAT and O2 Sensor location? Much appreciated in this busy holiday season. Thank you,

 

[Coolhandluke]

New to this forum, and also new to the W463 so I have many items that I need some wisdom on. Thanks in advance
I recently acquired a 1995 W463 G320. The markings on the Motor Block say: 104 011 1601 (not sure if this is a 996 motor that I see talked about here)

My main question is that the car was imported from Georgia (the country) to Virginia, that's where it was purchased from. It now lives in California (yes a problem)

Once I had it in the air the Exhaust is a mess (to be sorted later), the main issue is that it has had for what ever reason the O2 sensor removed.

Potentially stupid questions to Follow:

1-Did the 95 Euro W463 in fact have an O2 sensor (I'm pretty sure yes for engine management)​

​

2- Does anyone have a wiring diagram that shows the O2 sensor so I can get to the ECU and see if I can trace wires out of it maybe they cut it off or just unplugged it and the connector still lives​

​

3-I did find a plug hanging in the area in the motor compartment passenger side, a weather pack looking connector. It is a Two wire connector​

​

4- was the factory O2 Sensor 2 wire​

I hope I can get some advice and or direction, Thank you.

Hi Stranchy, Sorry if I am late to the party but I attach a diagram of the exhaust system and highlighted where the O2 sensor would be located. Also the Old and New part number of the O2 sensor. Its likely that you would have a 4-pin round plug (Part no. A000 540 68 17) but these are no longer available from MB. The replacement is A000 540 68 17 but this has a completely different fitting. I used the old wires and plug and sourced the correct new fitting but that is a nightmare to track the maker of the male/female new connector. Probably easier to cut and solder the wires. Hope it helps. Regards, CHL

 

[Coolhandluke]

Sorry the new part number is A000 540 79 17.

 

[Stranchy]

Hi Stranchy, Sorry if I am late to the party but I attach a diagram of the exhaust system and highlighted where the O2 sensor would be located. Also the Old and New part number of the O2 sensor. Its likely that you would have a 4-pin round plug (Part no. A000 540 68 17) but these are no longer available from MB. The replacement is A000 540 68 17 but this has a completely different fitting. I used the old wires and plug and sourced the correct new fitting but that is a nightmare to track the maker of the male/female new connector. Probably easier to cut and solder the wires. Hope it helps. Regards, CHL

Thank you Coolhandluke, much appreciated, so in your diagram is #1 the CAT or a muffler for a total of 3 mufflers. I Plan to add a CAT after the O2 sensor then the 3 Exhaust units.

 

[Coolhandluke]

Hi Stranchy, So No. 1 is a complete unit that is the Catalytic convertor. The red circle I made is just pipes and that is where the O2 sensor fits. It actually sits on top of the pipe is is really in a difficult position to get the O2 sensor out or in, especially with the exhaust in situ. The original part number was A463 490 2014 but it is No longer available from MB. I attach a photo of the actual drawing from MB that should make it clearer. Hope this helps. Rgds CHL

 

[Coolhandluke]

I forgot to mention that it is not very clear where the O2 sensor sits. But where I made the Red circle on the previous Photo is about right.

 

[Falkon]

I forgot to mention that it is not very clear where the O2 sensor sits. But where I made the Red circle on the previous Photo is about right.

I think it is also worth adding that the O2 Sensor is located "Pre-CAT", that is before the CAT, in the direction of the exhaust stream coming from the engine.

So it makes me to ponder that the CAT efficiency has zero to no impact on engine performance, rather it is there only for environmental emissions regulation observance. Could someone correct me here if I am mistaken.

 

[Stranchy]

Hi Stranchy, So No. 1 is a complete unit that is the Catalytic convertor. The red circle I made is just pipes and that is where the O2 sensor fits. It actually sits on top of the pipe is is really in a difficult position to get the O2 sensor out or in, especially with the exhaust in situ. The original part number was A463 490 2014 but it is No longer available from MB. I attach a photo of the actual drawing from MB that should make it clearer. Hope this helps. Rgds CHL

Coolhandluke, Thanks for the clarification. I still have a question of components, I get the tubes from the Exhaust manifold join pre cat then the O2 sensor, then into the CAT ( all clear to here) from the CAT is there a muffler Passenger side before traveling to the rear muffler then back up driver side to a muffler and out of the driver side. I think there is 1 O2 sensor, 1 Cat and 3 Mufflers, please let me know your thoughts.
Merry Christmas and Happy Holidays to all. Last thing I was hoping to use an O2 sensor from a 1995 E-320 that is still available, do you see any issues with that?

 

[Stranchy]

I think it is also worth adding that the O2 Sensor is located "Pre-CAT", that is before the CAT, in the direction of the exhaust stream coming from the engine.

So it makes me to ponder that the CAT efficiency has zero to no impact on engine performance, rather it is there only for environmental emissions regulation observance. Could someone correct me here if I am mistaken.

Falcon, yes the CAT efficiency has zero to no impact on engine performance, rather it is there only for environmental emissions regulation, from what I read this was the early attempts in Europe to start worrying about pollution. Without the O2 sensor in my case the car defaults to rich. Hopefully that will be rectified soon.

 

[Coolhandluke]

Hi Stranchy,
Let's try and clear this up. From my original drawing the first Muffler (on my left hand drive car is under Passenger side) after the O2 sensor is the CAT. It is one unit that then couples to a short mid-muffler (see pictures attached) that is over the rear axle. This connects to the end-muffler (its one unit that is on the Drivers side) as you can see in the pictures. There is only one O2 sensor in the location I previously described. So in total there is one Cat, one Mid (Pt. No. A463 490 2001) and one End muffler Pt. No. A463 490 4401). The End muffler has its Inlet and Outlet on the same end.
I hope this helps. Cheers CHL and Merry Christmas to all the members and G owners.

 

[Coolhandluke]

As for the O2 sensor, I cannot be sure. But if that car has the same M104 straight six engine with the same O2 body connector I guess it should work.

 

[Stranchy]

Hi Stranchy,
Let's try and clear this up. From my original drawing the first Muffler (on my left hand drive car is under Passenger side) after the O2 sensor is the CAT. It is one unit that then couples to a short mid-muffler (see pictures attached) that is over the rear axle. This connects to the end-muffler (its one unit that is on the Drivers side) as you can see in the pictures. There is only one O2 sensor in the location I previously described. So in total there is one Cat, one Mid (Pt. No. A463 490 2001) and one End muffler Pt. No. A463 490 4401). The End muffler has its Inlet and Outlet on the same end.
I hope this helps. Cheers CHL and Merry Christmas to all the members and G owners.

Coolhandluke, all clear and thanks, I was unaware that the Cat and passenger side muffler were one unit, I will have to split them up, seems to be the most cost effective method since the original cat/muffler is unavailable. Mine has mufflers in all three locations but no CAT or O2 sensor it's not right and rusted but that will all be handled soon. Did you replace your mufflers? Stock? if so where did you find them? If not what did you use.

So thankful for the help.
Stranchy

 

[Coolhandluke]

Hi Stranchy, I was really lucky and managed to buy some of the last stock in Europe of the Mid and end muffler (which is why I still have my old parts in the photos). The front CAT is just not available any longer, so I just hope and pray that it lasts a few more years. You can always try the following Suppliers that I use. There is one other thought I just remembered is that it is possible (I believe) to replace the Mid muffler with the G350D short connector pipe. But I guess that also depends on the environmental impact in your area of the world. I think gparts 24 has it on their website, see below.

1. This is my contact where I got my exhaust parts and many other parts. Kristoffer speaks perfect English and is super helpful.
Kristoffer Madsen
Parts Specialist
Gørløse Autoimport ApS,
Mercedes-Benz Specialist,
Raasigvangen 6-8,
DK-3550 Slangerup,
Tel: +45 48 21 78 78,
Direct: +45 71 99 78 29

2. This probably has the most comprehensive supplies of G wagon parts anywhere. Brilliant company, although I have never spoken to them on the phone.
gparts24.com
Sieversdamm 5d
30916 Isernhagen
info[at]gparts24.com
Tel: +49 01575-8758851

3. Norman is truly brilliant and has a great selection of MB parts and for the G-wagons. He speaks perfect English and is very helpful
Norman Kurth
Kurth Classics Autoparts
Tel: +49 (0) 176 3444 73 79
Email: info@kurth-classics.de

4. They specialize in used parts (they act as intermediary, advertising) . I have bought several parts and had no issues.
RRR.Lt
Žirmūnų g. 70 - 701, LT-09124 Vilnius, Lithuania
No phone contact

Well I hope that helps you. After that its either you make your own or get a local specialist to make one for you. Keep us posted, always happy to help.
Regards,
CHL

 

[Stranchy]

Hi Stranchy, I was really lucky and managed to buy some of the last stock in Europe of the Mid and end muffler (which is why I still have my old parts in the photos). The front CAT is just not available any longer, so I just hope and pray that it lasts a few more years. You can always try the following Suppliers that I use. There is one other thought I just remembered is that it is possible (I believe) to replace the Mid muffler with the G350D short connector pipe. But I guess that also depends on the environmental impact in your area of the world. I think gparts 24 has it on their website, see below.

1. This is my contact where I got my exhaust parts and many other parts. Kristoffer speaks perfect English and is super helpful.
Kristoffer Madsen
Parts Specialist
Gørløse Autoimport ApS,
Mercedes-Benz Specialist,
Raasigvangen 6-8,
DK-3550 Slangerup,
Tel: +45 48 21 78 78,
Direct: +45 71 99 78 29

2. This probably has the most comprehensive supplies of G wagon parts anywhere. Brilliant company, although I have never spoken to them on the phone.
gparts24.com
Sieversdamm 5d
30916 Isernhagen
info[at]gparts24.com
Tel: +49 01575-8758851

3. Norman is truly brilliant and has a great selection of MB parts and for the G-wagons. He speaks perfect English and is very helpful
Norman Kurth
Kurth Classics Autoparts
Tel: +49 (0) 176 3444 73 79
Email: info@kurth-classics.de

4. They specialize in used parts (they act as intermediary, advertising) . I have bought several parts and had no issues.
RRR.Lt
Žirmūnų g. 70 - 701, LT-09124 Vilnius, Lithuania
No phone contact

Well I hope that helps you. After that its either you make your own or get a local specialist to make one for you. Keep us posted, always happy to help.
Regards,
CHL

CHL, thank you so much for the information and your time. I will look into these sources for mufflers and few other parts I am in need of especially the lower radiator hose that has a Y right after it comes of the lower outlet of the radiator. For the Exhaust I think I found a CARB legal Cat for the E320 new (CARB is the Emission police here in California) I also found a couple muffler shops that have done hot rod type stuff who are willing to take a look. I will post pictures once I am done. Turns out that the 1995 G-320 is actually a Brabus modified version at 3.6L, at first we thought it was just e-bay badging but after checking the stroke on the engine and other engine components it truly is a Brabus, kind of exciting discovery. Do you have to deal with Smog Checks where you are?

 

[The G320 Driver]

The o2 sensor is pre heated that’s why 4 wires. Stretchy you can follow the diagrams mainly the HFM_WIS LOGIC which I send you. This will help to understand the principle behind the method.its in English
It is the first muffler where the 2 pipes from the engine exhaust manifold joining.

There must be a resistance as bridge or with some 8-10 or more Ohms on the wiring where it’s located, the location is abow the catalisator to prevent an ecu fault.

 

[Coolhandluke]

Hi Stranchy,
Well you are very lucky to have a Brabus version. This might change the dynamics of the exhaust a little as I believe they had their own exhaust to provide a little more power, but that's about the limit of my knowledge on that.
The Hose you are referring to is (as far as I know) still available from Mercedes Benz. I replaced all my hoses last year when I did a full flush through. As for Smog tests, we have to pass an annual test known here in Holland as APK (in UK it is MOT) that includes gas emissions. Actually, now I only have to take my car every two years which is really great. I would say that is worthwhile the small cost to add a fuel cleaning additive two times per year. Keeps the CAT clean and the Throttle-body and injectors.
Regards,
CHL

 

[Stranchy]

The o2 sensor is pre heated that’s why 4 wires. Stretchy you can follow the diagrams mainly the HFM_WIS LOGIC which I send you. This will help to understand the principle behind the method.its in English
It is the first muffler where the 2 pipes from the engine exhaust manifold joining.

There must be a resistance as bridge or with some 8-10 or more Ohms on the wiring where it’s located, the location is abow the catalisator to prevent an ecu fault.

Thank you for the clarification, I am in the process of checking that, I ordered a CAT and the sensor, should be here soon. Cheers

 

[Stranchy]

Hi Stranchy,
Well you are very lucky to have a Brabus version. This might change the dynamics of the exhaust a little as I believe they had their own exhaust to provide a little more power, but that's about the limit of my knowledge on that.
The Hose you are referring to is (as far as I know) still available from Mercedes Benz. I replaced all my hoses last year when I did a full flush through. As for Smog tests, we have to pass an annual test known here in Holland as APK (in UK it is MOT) that includes gas emissions. Actually, now I only have to take my car every two years which is really great. I would say that is worthwhile the small cost to add a fuel cleaning additive two times per year. Keeps the CAT clean and the Throttle-body and injectors.
Regards,
CHL

Thanks CHL, any chance you have the P/N for that lower hose?

 

[Coolhandluke]

Hi Stranchy,
Please find attached picture and part number. W463 501 0682.
Hope you can find one.
There is a Guy who makes YouTube videos all about G wagons, based in the US. Here is his details, maybe worth a call.
Nationwide Auto Experts
Joe@Allianceautocare.com
970-660-4429
Best regards,
CHL

 

[Stranchy]

Hi Stranchy,
Please find attached picture and part number. W463 501 0682.
Hope you can find one.
There is a Guy who makes YouTube videos all about G wagons, based in the US. Here is his details, maybe worth a call.
Nationwide Auto Experts
Joe@Allianceautocare.com
970-660-4429
Best regards,
CHL

CHL, as always thanks for your help I will check into both.
Happy Holidays...