Last post on Jan 30, 2013 at 6:14 PM
You are in the Chevrolet Impala
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Chevrolet Impala, Sedan
#44 of 45 Stalled start, slightly fluctuating rpms, pf420 inefficiency below thresh
Jan 30, 2013 (6:07 pm)
Every time I go to start my 2001 Chevrolet Impala, it takes at least three tries before it cranks. its giving me what I remembered being a pf420 code below threshold. I replaced my o2 censor before the cat converter but no cigar. I also believe my alternator is falling behind because the brightness of all of the interior and ext lights fluctuates as well.
I was told it was probably a crank sensor but wanted a second opinion before I go spending that money.
#45 of 45 Re: Stalled start, slightly fluctuating rpms, pf420 inefficiency below thresh [ctp2001imp]
Jan 30, 2013 (6:14 pm)
I assume you meant P0420 in your post. I did not see any mention of the crank sensor in this information: http://www.obd-codes.com/p0420
They mention a faulty cat or a faulty O2 sensor. The sensor after the cat is reading the same as the sensor before the cat.