P20BE error - O2 sensor which one
04-11-2013, 06:56 PM
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2010 ML Bluetec
P20BE error - O2 sensor which one
I'm getting P20BE code on 2010 ML BTC (120k) - description "(P20BE component G3/9 (right O2 sensor,before CAT,cylinder 1-3) heating,supply voltage (P0135))" suggests O2 sensor pre CAT However when I look under the car I can't find O2 sensor before CAT. There are two temp sensors in CAT (one in front one in middle) and O2 sensor on pipe far behind CAT
Any suggestion which one to replace?
Any suggestion which one to replace?
04-14-2013, 05:59 PM
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2008 ML63 AMG
There will always be a primary 02 and then a secondary 02 after the catalytic converter. Not sure which bank is 1-3 on the ML BTC but I'm sure it will be in your owner's manual or possibly even in the engine bay somewhere. Some engines have them written in the block. How is it running? If your primary 02 is acting up that should be running weird since fuel trims would be off. Odd that your primary would be bad since 02 sensors usually are good for 100K and typically the rear is the first to "go". Good luck!
