club.liberty.asn.au

Is anyone aware of an aftermarket sensor to treat the P0037 engine code error?

The scan tool noted the code as 'H02S Heater Control Circuit Low (Bank 1 Sensor 2)'.

Any assistance is appreciated.

While the code points to a faulty sensor, there are other conditions that will cause this code to log.

This code relates to lower than expected current through the post cat O2 sensors heater circuit. It may well be an open or partial open circuit in the heater but could be any other fault in the circuit that supplies or grounds the heater circuit.

Often *(I dont have a wiring diagram)* the heater circuit is supplied battery voltage via a relay and/or a fuse, so an open circuit fault with these will log the same code.







*Note: Often the model year/engine/symptoms/any other info are handy when asking for help.

Getting a tune from kido aka ThrottleHappy will generally disable the rear o2 sensor

Does his tune disable this code (circuit fault), as well as the cat performance (emission fault) code?

My understanding is the cel codes are deleted but the sensor input can be repurposed for an external sensor which can be logged via a custom parameter over obdii.

Sounds like post cat wideband logging.

Neat.

/offtopic

So is this as simple as replacing the relevant sensor?

You'd start by checking the plug/loom connection, clean/slightly twist the pins to promote continuity.
Google the issue/your model, try a known good sensor if you can source it cheap, eg self serve wrecking yard...
What's your cars model/engine?