2009 E550 4Matic code p2237
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2007 cls 550
2009 E550 4Matic code p2237
My car is straight piped I just put in two new 02 sensors up stream i drove the car from the shop and went home came back out and drove again check engine light came on for P2237 but I just put two new 02 sensors in what can the problem be
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From: MA
2008 E350 4Matic, 2011 E350 4matic
Did you actually check the code? P2237 is O2 sensor heater circuit is open or shorted causing the circuit voltage control to be open. That means either it's not connected, something is wrong with the O2 sensor, maybe wrong one or there's some problem with the wiring. The heater circuit is part of the O2 sensor so you have a problem somewhere between the O2 sensor and the other end of that wire. Basically double check the work and make sure the correct sensor was installed. Or it has something to do with the straight pipe and whatever was done to bypass emissions if any. I like to breathe and I like others to be able to do the same so I don't play with the stock exhaust.
Thread Starter
Member
Joined: Jan 2021
Posts: 125
Likes: 5
2007 cls 550
Did you actually check the code? P2237 is O2 sensor heater circuit is open or shorted causing the circuit voltage control to be open. That means either it's not connected, something is wrong with the O2 sensor, maybe wrong one or there's some problem with the wiring. The heater circuit is part of the O2 sensor so you have a problem somewhere between the O2 sensor and the other end of that wire. Basically double check the work and make sure the correct sensor was installed. Or it has something to do with the straight pipe and whatever was done to bypass emissions if any. I like to breathe and I like others to be able to do the same so I don't play with the stock exhaust.
MBWorld Fanatic!
Joined: Feb 2014
Posts: 6,189
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From: MA
2008 E350 4Matic, 2011 E350 4matic
Means I don't know what you did when you said you straight piped the car. Did you gut the cats and straight piped the entire exhaust? If someone did it for you, they probably did some kind of MIL eliminator setup on it and that probably had something to do with the old O2 sensors. Or you didn't gut the cats and just got bad O2 sensors. Lots of fakes out there especially on places like eBay and Amazon. It's a lot easier to repair things when they haven't been modded in the first place.
Thread Starter
Member
Joined: Jan 2021
Posts: 125
Likes: 5
2007 cls 550
Means I don't know what you did when you said you straight piped the car. Did you gut the cats and straight piped the entire exhaust? If someone did it for you, they probably did some kind of MIL eliminator setup on it and that probably had something to do with the old O2 sensors. Or you didn't gut the cats and just got bad O2 sensors. Lots of fakes out there especially on places like eBay and Amazon. It's a lot easier to repair things when they haven't been modded in the first place.
MBWorld Fanatic!
Joined: Feb 2014
Posts: 6,189
Likes: 1,549
From: MA
2008 E350 4Matic, 2011 E350 4matic
Well you don't need O2 sensors when there's no cats! There's usually some work around to make it work with no cats. Probably some special setup which you disturbed by changing the O2 sensors. So no idea, go back to whoever did it.
Thread Starter
Member
Joined: Jan 2021
Posts: 125
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2007 cls 550
lol I then waisted some money then thanks alot
