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Mercedes M Class Mercedes ML350 and Mercedes ML500 SUV's.

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Old 10-09-2016, 05:03 PM
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Default Rear Oxygen Sensors


I am pretty sure this topic has been discussed numerous times and it has always been #1 recommendation to use Original Bosch Oxygen Sensors no matter what. That is exactly what I did but still have Error Codes.
Brief history:
1. Got Error Code for Bank 1/2 Fronts and Rears O2's
2. Replaced front Banks 1/2 with Bosch 13782 O2's. Drove for a while and was still getting Errors Bank 1/2 Rears
2. I have placed Aftermarket O2's on both rear banks and they failed after about 1 week. Well, I knew it but tried anyway. The car has 202k miles and didn't want to spent a lot to make it to run for a few years.
2. Now I have decided to go with Universal Bosch 15738 while using connectors removed from aftermarket set. Match all wires correctly and secured them in place. Now, after 2 weeks of driving I am getting the same error again for Banks 1/2 Rear. Same code as before (don't remember the # from the top of my head).

Do Universal Bosch O2's are good enough for ML320, 98 or I need to get Bosch 13782? Perhaps maybe there is something else that I am not aware about. The passenger side has aftermarket Catalytic that is 2 years old while driver side is still original. Please help guys as I am due for a Smog Check in 1 month.

Thank you
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Old 10-10-2016, 05:28 PM's Avatar
Join Date: May 2012
Posts: 1,237

Hello...check out this tech article from our site. It should help you out with your install. If you have any other questions, feel free to post a Comment just below the article and someone will get back to you with more detailed info. Best of luck!

Mercedes-Benz W203 Oxygen Sensor Replacement - (2003-2005) C230K | Pelican Parts DIY Maintenance Article

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