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Alarm code 2-2-1 2-3-1 and 1-2-1 AMM

posted by  Hendrik on  Sat May 21 07:33 CST 2005
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get the fault codes 2-2-1 and 2-3-1 I now what the mean (fuel system compensating for rich or lean fuel mixure..)I have replaced the fuel filter first time after 150000 miles/ air filter. Cleaned throttle body.
I do not notice much difference in driving except a little rough idle.(was very rough before I replace fuel filter and used Techron.
Does any one have any suggestions in which direction I should look next.

I checked the AMM and O2 sensor and I think they are working fine. I also disconnected the wire harness from the ECU to check different V, and the failure codes were gone for a couple of days.It just showed up again.The only thing on the O2 sensor as I meaured the green wire at the ECU I shouyld have measures continuity, but it did not,Please help

I do know get a 1-2-1 code as well AMM. Do I have to check the input or can I assume that the AMM is damaged.The car starts to run very rough at idle and is hart to start.Ones at temp it is idling better, but not good Also fluctuates at fixed rpm.
I have had this replaced abour a year ago with a used one done by Volvo.
They told me it was hart to measure the AMM
I think I am getting there it is just not an absolute failure rather slow






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