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Author Topic: 121 fault code  (Read 972 times)

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Damonsal

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121 fault code
« 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
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Re: 121 fault code
« Reply #1 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?
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TheBoy

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Re: 121 fault code
« Reply #2 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....
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Damonsal

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Re: 121 fault code
« Reply #3 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..

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