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Diagnostic Codes 200 92

On a '92 240 with LH 2.4 Jetronic I am getting the following Codes:

1-2-1 Fault in signal for air mass meter.

2-2-1 Fuel system compensating for extremely rich or extremely lean running

condition at cruise.

2-3-2 Fuel system compensating for rich or lean mixture at idle.

Question is where and what do I start looking for.

Thanks

David







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