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I have a CEL that usually stays on.. but does at times turn off before coming back up. I had the codes read and get 3 at the moment...
P0300 - this has been an on/off issue for a while. No noticeable misfiring or engine stuttering.
I also have a P1273 and P0455 at the moment.
Where could I start to get rid of these(?).. before my SMOG, which is due within two weeks. I would like to keep this car running on the road, since I have no other issues other than this CEL. As I mentioned, the CEL does turn off at times but stays off only about 30-100 miles. Any help would be great. Thanks!!!
Thank you for the feedback! That is some great info. I will check several areas like the intake and other hoses for vacuum leaks. The car is an 04í w/ a whopping 256k miles and running strong... other than a visible CEL.
Otherwise, I hope itís not the intake manifold leaking(?) I did do the spark plugs and removed the plenum twice (reusing the same ďnewĒ gasket the second time), so I hope thatís not leaking air. I also replaced the rear air fuel sensor w/ an eBay sensor when I had the intake mani out because it took 2 minutes to replace over. Itís the one that sits up top, near firewall and hard to get to unless the intake mani is out. Canít remember if thatís B1S1? It fixed a previous CEL when I put that sensor in... but I wouldnít be surprised if that sensor failed, since it was a cheap eBay part. Or is B1S1 located elsewhere?
As I mentioned, the code does turn off from time to time but I cannot get it to stay off for more than about 30 miles usually. (Plus I donít think itís actually cleared from the system when itís ďOFFĒ).
Looking into it some more.. could the cause potentially be a bad evap purge valve causing the large “leak” allowing the sensor to read the lean amount? Still not sure about the P1273 or the exact cause of the P0300 but looking online and the P0455, it seems to be a common problem with the evap purge valve staying stuck open....
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