Review on Sensor，ECCPP Upstream Downstream 234 5060 200 2002 by Jeff Pfaff
P0037 Lower O2 Sensor Error
Triggers a P0037 HO2S heater control circuit low (bank 1 sensor 2) and is set when the PCM detects an out of range #2 (downstream) HO2S signal voltage. - I think it's possible that initially it worked for one cycle. -- Anyway, the vendor, ECCPP, doesn't seem to know what to do about it, apparently nothing. My advice: don't waste your time.
- PROPERTIES - The O2 sensor can improve engine performance and fuel economy, reduce CO2 and other harmful emissions, and extend the life of an expensive catalytic converter
- There are other interesting options.
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