bad tune? p0300
Thread Starter
Teching In
Joined: Feb 2013
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i have no clue about tune, just put the car up on the lift for kicks and giggles and noticed that the o2 sensors in the rear are just gone, and the pcm must have them tuned out. the front 2 sensors look brand new with not much carbon buildup. going to be posting pictures soon with screenshots on scanner.
Thread Starter
Teching In
Joined: Feb 2013
Posts: 20
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Thread Starter
Teching In
Joined: Feb 2013
Posts: 20
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From what I see there it is a random miss. In other words multiple cylinders. I would want to compare the banks, one and two for common events if most miss on one bank then look for why. Look at both sensor ones. Disregard sensor two. Sensor ones should make full high low swing.
Thread Starter
Teching In
Joined: Feb 2013
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I traced the wires from the 2 upatream o2 sensors and found a wire that was partially exposed, possibly from heat from headers. When driving the vibrations would short out the bank 2 sensor which in turn would default it to ~450mv. Ended up just replacing both sensors anyways just because. So far no issues (60 miles driven).
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Verdad Gallardo Reread what you wrote. Did you replace the 1 or upstream sensors or the 2 or downstream sensors. The important ones are the position 1. The position 2 are catalyst monitor's only.
Thread Starter
Teching In
Joined: Feb 2013
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I replaced both upstream sensors, drive around for a long while last night with no issues what's so ever, let it idle this morning with no problem then drive to work no problem, idled at work and service engine soon light can on
