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Answered by KHLow2008 (expert)
40,318 answers provided

the code is p0031 oxygen sensor heater control ciruit bank1 sensor 1 i used the scaner to erase the faulit so after i drove the lexus gx470 for 10km the check engine light came on again i used 2 bottels of fuel injector cleaner and 1 bottle of octane booster i said maybe the problem will be fixed it didn't so how can i fix it

Response from mohmed
2 questions asked

P0031 - Oxygen sensor heater control ciruit (Bank1 Sensor 1)

DTC P0031 is set when heater current of 0.2 amps or less is present when heater operates with +B at greater than 10.5 volts and less than 11.5 volts (one trip detection logic) or heater current of 0.25 amps or less when heater operates with +B at greater than 11.5 volts (one trip detection logic).

Possible causes are:

l Open or short in heater circuit of heated oxygen sensor.
l Faulty heated oxygen sensor heater.
l Faulty relay.
l Faulty ECM.

If the sensor is bad, which seems to be the case, it has to be replaced to rectify the fault.

Answered by KHLow2008 (expert)
40,318 answers provided