Quote:
Originally Posted by GhostDakota
Codes:
P0420 - Catalyst Efficieny below threshold Bank 1
P0300 - Random misfire detected
P0140 - o2 Sensor No Activity Detected (from when I disconnected the one o2 sensor)
Even with only 25 miles? That was such a PITA and I never want to do that again lol. My damn hands are too big.
Yes, the front o2 is unplugged and it ran a lot better with it like that. On my Jeeps at least, if the front o2 is not reading/unplugged, the computer will run a pre-programmed setting.
I'll check the filter, thanks!
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Disconnecting the front O2 will put you into open loop, which kind of isolates where the problem may be.
Have you changed anything since it was running well?