Hi all....

Yesterday I thought I would try out some of that Water wetter stuff in the cooling system, everything was fine yesterday...

Today I started the car as normal and engine managment light came on... done a check of the code on my psi3 unit and it says P0031 code...

HO2S Heater Control Circuit Low (bank 1 sensor 1)

I have drained all the water wetter stuff out of the cooling system and refilled with coolant and water, done an ecu reset and after starting the car each time the code comes back....

Anyone tell me how to fix this problem or is it a trip to a Subaru dealer?

Heater and Air conditioning all working fine btw

car is a 2002 type UK Impreza Sti

cheers

Andy

 

Its nothing to do wth the cabin heater, its the lambda sensor. On the impreza its the heated type....it has a heating element in it to help it work quicker after engine start, so the fault code is "O2 (oxygen) sensor heater".
On bug eyes there is an inherent ...er...bug... in the software which throws this code under certain circumstances. I used to get it when hitting high revs after a petrol fill up. the code should reset after you start and stop the engine 4 times in a row. If it still shows , then you really do have a fault.new sensor required, or there is a fault i the wiring

 

Thanks for your help mate....

Much appreciated, will see how it goes then... just filled up this morning with a full tank of Greenergy 99,

Do I have to keep resetting the ecu to try and get rid of the code or will it go by itself?

Thanks

Andy

 

Andy, try the stop start procedure above then do a reset and see what happens. Could be the sensor or dodgy connection I suppose too.

Andy.

 

I tried the start and stop 4 times in a row and the ecu reset last night but as soon as I start the car the engine light comes on...

looks like a trip to Northants Subaru......

Andy

 

Been in touch with a Subaru dealer today to see how much a new sensor is....

I was expecting about £70

To my amazement the service guy says oh I dont keep them in stock - they are £291.70 + Vat

So needless to say I haven't done anything about it yet until I can get it in to a garage...

Anyone know a place that sells them any cheaper?

cheers

Andy

 

Had this exact fault on my bugeye. Was told you are ok to run the car until you can sort it. Went to JAP PERFORMANCE PARTS and it cost £75 just make sure it is the correct one, the guys down there are nice and helpful.

 

Thanks for the info mate......

What is the exact part or part number?, any idea so I know what to ask for...

thanks

Andy

 

Just tried JAP PERFORMANCE PARTS

but they are out of stock of this part...

Anyone else know of Subaru breakers or a place to get a new one from?

cheers

Andy

 

Try David at API engines.

Andy.