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960 Bad ECM???? 900 1994

posted by  DanR on  Sat Mar 30 08:55 CST 2002
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last visit: Thu Oct 23 15:25 CST 2014
[RELATED]

Failed our states emissions test in Dec. just over the limit for HC. Approaching 200k miles everyone figures its the cat. It is the original one so it makes sense. Before the work is done check engine lights up. Pull code 212 O2 signal, cannot reset, figure new O2 sensor while I am at it. Drive it about 2 months before I can get the time to replace everything. All new cat. and O2 sensor, drive it about 10 minutes from cold and check engine light comes back on, codes the same 212. Check all connections and reset. Drive it about 45 minutes before light comes back, 212. Reset code and drive for 2 days before light comes back on. Now it will not reset, always showing 212.

Today with the volvo fault tracing book, checked all connections to the ECM everything checks out with the book, all values are within specs. all voltages are correct. WHAT ARE THE ODDS THAT I INSTALLED A DEFECTIVE 02 SENSOR? or worse is the ECM bad.

And will driving it in the default mode harm my new cat.?

Any and all comments welcome.

DanR 94 964 193k miles
--
DanR






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