Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: Damonsal on 14 July 2007, 10:13:47

Title: 121 fault code
Post by: Damonsal on 14 July 2007, 10:13:47

Hello All,

I have got problems with the Omega again :(

Yesterday it has started running rough, stalling on idle (feels like it is missing a cylinder or two).

I replaced all plugs and leads resently so I doubt its that, the cam covers too, so I have checked the plugs and there is no sign of oil.

I have done the paper clip test and there is a 121 code. "Oxygen sensor 2 Lean exhaust, weak mixture".

Is there any common things I should check here?

Cheers

Damon

Title: Re: 121 fault code
Post by: Auto Addict on 14 July 2007, 20:37:14

Don't know what the fault code means, but have you cleaned the breathers and throttle body lately?

Title: Re: 121 fault code
Post by: TheBoy on 14 July 2007, 20:44:50

Means that bank is running too lean. Or the sensor is fubar.

For just one bank lean, I would initially consider the possibility of the sensor....

Title: Re: 121 fault code
Post by: Damonsal on 15 July 2007, 23:41:04

Thanks..

Well things have turned for the worse with this car. I dont know quite what to do and if its worth repairing, (annoying after spending a lot replacing all the wishbones, drop links, steering idler, tyres to get it through the MOT)..

The engine has developed a loud tapping, feels rough (as above) but worse, and is blowing a bit of oil through the breather system..