? about 4 cat system
#1
#7
'97 / '03 are very different than the 2004/2005 4 cat systems. '04/'05 rear O2s only monitor the front cats. The rears are not monitored for efficiency. Therefore, no CEL. As stated, it is a 50/50 chance a '97/'03 will throw a CEL and require O2 sims or tuning.
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#9