jimmy gee

can any one tell me what ho2s bank 1 sensor 2 heater circuit low means.its fault code poo37,it puts my engine light on but the car runs fine,i just reset it and away it goes,then when you start it back up it comes back on

jura11

iTrader: (7)

You are running decat?

If yes has been mapped for this?

But can be your O2/Lambda sensor is knackered/damaged and you will need replace.

What car is yours?


Jura

Midlife......

iTrader: (2)

your front 02 sensor has a heater circuit as it works best at EGT temps so it's heated when cold. As long as the engine is up to temp it should be OK but will give false reading when cold. Could be loose wiring or a fuse.........or a new front 02 sensor which is a bit more expensive.

Just from the top of my head though so could be wrong...


Shaun

Midlife......

iTrader: (2)

de-cat CEL for the rear sensor is P0420.....

Shaun

jimmy gee

its a 02 sti type uk bugeye and yes its been decated.the lamda sensor is in the down pipe,iam useing a classic up pipe no place in up pipe for lamda so this could be my problem

jura11

iTrader: (7)

Shaun

P0037 is REAR O2 SENSOR HEATER CONTROL CIRCUIT LOW (BANK 1 SENSOR 2)


Jura

jura11

iTrader: (7)

This error is for rear O2/Lambda sensor not for front etc.

Rear one O2 sensor is usually cheaper than front one


Jura

jimmy gee

thanks for the help lads thats cleared that problem up.as i say i had to use a set of headers off a classic when my equalenth headers gave up on me i had to fit a set of stanard classic headers i had lying about to get me back on the road quick

Midlife......

iTrader: (2)

As I said Jura.........it was off the top of my head LOL

Shaun

PS........which sensors have you put where ?? ie the front and rear 02 sensors. The bug STi has no sensor in the up-pipe anyway (Bug WRX has an up-pipe EGT sensor).

jimmy gee

sorry mate i was off line there for a while computer crashed,i have put a front sensor in the down pipe mate only place i could put it,

Midlife......

iTrader: (2)

http://www.wrxtuners.com/forums/atta...st-diagram.gif

Why can't you put the Front 02 sensor in the exhaus tmanifold where it belongs..?

Shaun

rob84

iTrader: (5)

Not really too common for the rear to go down, just check the wire hasnt come unclipped and rubbed through on the propshaft

Midlife......

iTrader: (2)

Rob84.......it appears that it's a Front 02 sensor in the downpipe where the rear 02 sensor lives....mind you I'm easilly confused LOL

Shaun

wrx_2005

Sorry to trouble you, but I am confused over which sensor I need replacing.
I am getting P0037 HO2S Heater Control Circuit Low (Bank 1 Sensor 2).
on my newage WRX 2005 Blobeye. all 3 CATS have been removed.
not sure if its the front or rear sensor, and can also do with how many wires this sensor has and what the colours are ?any advise welcome.

rob84

iTrader: (5)

to clear this up
bank one sensor two is the rear sensor after the downpipe where the 2nd cat would be.
bank one sensor one is in the manifold on the collector before the up-pipe on a newage

wrx_2005

thanks mate, I think I know which one you are referring to. its the one horizontal along the system, where I have had a straight decat pipe fitted ?

rob84

iTrader: (5)

Yes thats the one mate, Just make sure the wire isnt fouling the propshaft, I've seen a few rub through on there because there wires not been secured into the metal support bracket for the gearbox

wrx_2005

thanks, you wouldn't happen to know how many wires from this sensor and what the colours of these wires would be ? there are some on ebay but they are 3 or 4 wire ones and different colours.

http://www.ebay.co.uk/itm/Direct-fit...51136455616%26

rob84

iTrader: (5)

Couldnt tell you off the top of my head I'm Afraid. will look in the morning at work and post up

wrx_2005

much appreciated.

jura11

iTrader: (7)

Have look on this,hope this help

http://opposedforces.com/parts/impre...ystem/exhaust/


Jura

rob84

iTrader: (5)

4 wires.
2 black
1 blue
1 white

wrx_2005

that's great and I think the part no. that relates to this rear Lambda sensor is 22641AA042.
thanks everyone.

now to find out where I can get it for less £££