DTC 0420 code?
08-03-2003, 08:41 PM
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Staging Lane
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Join Date: Jan 2003
Location: Central Iowa
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DTC 0420 code? Just got this (DTC 0420) tonight. Says left bank Cat efficency low. Haven't had time to watch left O2's to see if they switch on startup. Is this most likely a bad left rear O2 or is my cat (oh, darn, time for exhaust work) actually taking a dump? Tommorrow on the way to work I'll watch the O2 readings to see what they do.
