Can't get rid of this P2237 code on my 2009, I have read through many of the threads here. The code comes back pretty much immediately after resetting, not like most other codes. I have changed both O2 sensors, replaced with Denso. I changed the ECM, hoping that would solve it. Put in a used ECM from eBay, so I suppose it could have been faulty. Is it time to start chasing wires? Any suggestions on fuses or relays to check? I appreciate any input.
Where did you get the Denso sensors? I have seen cheap aftermarket (or counterfeit) Air Fuel Sensors cause this code. However it is unlikely that two sensors or two ECMs have the same fault. So yes, I would look at wiring. P2237 indicates an open in the Air Fuel "sense" circuit (AF+ & AF-). Posted via the PriusChat mobile app.
Thanks for the reply. The Denso sensors came from eBay. So I suppose they could be counterfeit, not sure if there's a good way to know? I will work look closely and test wiring, hopefully I can isolate the issue.
