Car throwing P0420 code and oil pressure above normal
03-02-2010, 10:42 PM
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Car throwing P0420 code and oil pressure above normal Yesterday morning the SES light came on so I took it to AutoZone to have them scan it and it was reading code P0420 (Catalyst efficiency low - bank 1). I've also noticed that the Oil Pressure gauge is showing a significant rise in oil pressure (normally it sits at around 45, now it sits around 55-60 or more if past 2/3 throttle). Off the top of my head I'm thinking maybe a bad PCV valve (would explain the increase in oil pressure),but I thought I would post and see if anyone else has experienced this and what the cause was in their case.
Any ideas?
Any ideas?
03-02-2010, 11:31 PM
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the p0420 cat low eff has to do with your cats or lack there of. if u have gutted cats or no cats all together. i would clear dtc and try and get sims for the rear o2 or tune it out. if you have cats and plan on keeping them i would do a back pressure test on the affected bank and replace cat that fails.
03-03-2010, 12:24 PM
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the p0420 cat low eff has to do with your cats or lack there of. if u have gutted cats or no cats all together. i would clear dtc and try and get sims for the rear o2 or tune it out. if you have cats and plan on keeping them i would do a back pressure test on the affected bank and replace cat that fails.
03-04-2010, 11:09 PM
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Oddly enough, I changed the PCV yesterday and last night it was still throwing the code. This morning, I got up and was driving to the dealership and on the way the code magically disappeared and the oil pressure was back to normal. Good thing too, because apparently I had the cats swapped back in '06 and the special warranty only covers them for another 12k miles after that (that was about 30k miles ago).
