Bailey808

Hi,

I had P0031 pop up, so I have replaced the front Oxygen (A/F) Sensor, but the CEL hasn't cleared? I have erased the code using OBD2 tool, but it appears straight away once I start the engine. Am I doing anything wrong? Or is there an issue elsewhere?

Any help would be appreciated.

Thanks
Jonny

rob84

iTrader: (5)

Did you replace it with a brand new one or a 2nd hand unit

Bailey808

It was a new sensor. The garage I bought the car from supplied it.

Infected by sti

iTrader: (6)

Was it an original Part?

Bailey808

No it wasn't. The garage are tight *******.

Infected by sti

iTrader: (6)

That may be your issue if they have cut and rejoin wires. Make sure they all connected and no wires are bare and exposed touching ground.

Other than that put a multimeter across the pins and see if you get resistance.

Bailey808

Hi,

I fitted the sensor myself, so no re-joins or exposed wires. The wires were a little bit shorter than the one they came out, however it still connected fine. I will put a multimeter across the pins and let you know what I get.

Thanks for your help.

JDM_Stig

iTrader: (3)

if it aint a Denso then you may struggle as mentioned.

rob84

iTrader: (5)

Seen issues like this in the past with non OE sensors. for some reason they just don't work as intended

Bailey808

You all correct! I checked the resistance and the parts numbers only to find that they had sent me sensor #2, which has a lower resistance (0.6 instead of 0.8). Bit stupid on my part, but that's definitely the issue.

Thanks for all your help gents!

Bailey808

Update: I have replaced the sensor with this: http://m.gendan.co.uk/product_LBX0306.html

Very reasonable price and quality looks just as good as Denso sensor. Fits perfect and no CEL! Sorted!

rob84

iTrader: (5)

good news, Glad you got sorted