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Discussion Starter · #1 ·
Just got 'rejected' (not 'failed') for Illinois emissions due to 'cat efficency not supported'.
Was cat eff supported in '96?

It is 'possible' that this pcm is actually OBD1... but it has always passed before.

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yes, obd2 has cat efficiency with the second set of o2's and fault codes for such.
see if an obd2 scanner recognizes the pcm.
 
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