SES after replacing o2 sensors, help!
06-23-2004, 10:41 PM
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SES after replacing o2 sensors, help! Okay, here's my dilemma:
Car has 81,000 miles with the mods listed in my sig. I got a SES light about 4 weeks ago, and the code was po430 (o2 sensors on rh bank according to scanner at autozone). I figured the o2's could use replacing, so I ponied up the funds and replaced all 4, then had the code cleared. Drove about 60 miles on the highway today, and when I got off at the ramp where I work, damn SES light again! Went back to autozone and checked the SES code, came up the same again! Had it cleared, and by the time I drove it home in the city (10 miles) it was back on! Car has stock manifolds, Y-pipe and exhaust except for a 3" single flowmaster muffler. My friend runs a speed shop and his guess was a dead cat possibly or a computer glitch (he mostly deals with older carb'd stuff and some LT1 cars but not much on LS1's). Any ideas? The car doesn't seem to idle bad, run rich or get poor mileage, but I'd like to clear it up soon.
TIA!
Derek
Car has 81,000 miles with the mods listed in my sig. I got a SES light about 4 weeks ago, and the code was po430 (o2 sensors on rh bank according to scanner at autozone). I figured the o2's could use replacing, so I ponied up the funds and replaced all 4, then had the code cleared. Drove about 60 miles on the highway today, and when I got off at the ramp where I work, damn SES light again! Went back to autozone and checked the SES code, came up the same again! Had it cleared, and by the time I drove it home in the city (10 miles) it was back on! Car has stock manifolds, Y-pipe and exhaust except for a 3" single flowmaster muffler. My friend runs a speed shop and his guess was a dead cat possibly or a computer glitch (he mostly deals with older carb'd stuff and some LT1 cars but not much on LS1's). Any ideas? The car doesn't seem to idle bad, run rich or get poor mileage, but I'd like to clear it up soon.
TIA!
Derek
06-24-2004, 01:17 PM
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I have a friend who is getting codes P0420 and P0430, which is the cat efficiency for both sides.
I was always under the impression that if cats were"going bad" the car would run like cr@p. In her case, with only 28K miles on it, it runs great.
We ran Auto Tap a few times and the rear O2 sensors readings look right, however, the front O2's both read quite low, thus the reason the computer thinks there is low efficiency. The cats can NOT make it richer. We can't figure out what is going on. We swapped a front O2 and it still read about the same.
I was always under the impression that if cats were"going bad" the car would run like cr@p. In her case, with only 28K miles on it, it runs great.
We ran Auto Tap a few times and the rear O2 sensors readings look right, however, the front O2's both read quite low, thus the reason the computer thinks there is low efficiency. The cats can NOT make it richer. We can't figure out what is going on. We swapped a front O2 and it still read about the same.
