ilya980

Hi,

I have a check engine light on. The code is P0056 H02S Heater Control Circuit Bank 2 Sensor 2. I assume, I need new driver side downstream oxygen sensor.

There are two part numbers, 001-540-95-17 and 004-542-07-18. Both described to fit 2008 E350 4matic 6-cylinder gasoline engine in the left rear position. One costs about $130, another one costs about $270.

What is the difference between the two parts? Which one is the correct one for my car?

Thanks.

konigstiger

0015409517 = downstream is correct for your 4matic if I have correct VIN. 0045420718 is non 4matic.

ilya980

Thank you! Yes, the VIN is correct.

cetialpha5

Looks like prices are coming down. FCPEuro has the Bosch at $123, but rockauto carries the same one for $66.79. They also have the Walker at closeout for $29.24. I got the Walker upstream sensors when they were on closeout and replaced them and it was fine.

https://www.fcpeuro.com/products/mer...osch-oem-16438

https://www.rockauto.com/en/moreinfo...t=5132&jsn=994

https://www.rockauto.com/en/moreinfo.php?pk=5036004