Quote:
Originally Posted by dpaul
FWIW P-codes are generic. If you've got ISTA installed it should be giving you a BMW hex code. The BMW codes may be no more enlightening than the OBDII codes but at least they are manufacturer-specific. So always report them both.
Furthermore, a freeze-frame of relevant data at the time the error code was set is available in your DME. I don't use ISTA much so I cannot tell you how to get it from ISTA but it's pretty simple with INPA. Figure out how to get it and post it.
Finally, it is always helpful to have a little more history than you've provided. For example, is your car stock or do you have a tune, test pipes etc. Any other symptoms, particularly, decreased fuel economy, black or white smoke on accel/decel, more carbon on exhaust tips than usual etc. How much oil are you using? You've replaced the o2 sensors twice? So you're on your third set? How long in between changes for the code to appear?
All that said, the most common explanations for P2626 are:
Bad sensor (or wire or connector)
Vacuum leak
Exhaust leak
Yes, there are more subtle explanations for your O2 code but those are the big three.
1) You've replaced the sensor twice - this is very unlikely to be a sensor problem. Of course, it's easy enough to test with a voltmeter and a propane torch. But wiring and connectors are often problematic.
2) You have a problem starting - could be unrelated but is consistent with vacuum leak. I'd expect idle issues as well if this were the case.
More precisely tell us why to you think "it seems like there may be excess fuel trying to be burnt there".
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Thank you for the response! The code was 00274A through ISTA. I'm not sure how to do freeze frame through it though so I'll have to figure that out. I'm only guessing fuel injector because of the harder start perhaps thinking that it may have fouled my plugs badly, but I'd assume it would always run rough then.
Vacuum I'm guessing not especially because idle is completely fine. It jumps a bit for 2-3 seconds after the hard start and that's it. It's perfectly smooth after that.
There are also no running issues. The reason I doubt it's an O2 sensor aside from already having done two new ones is that all of the monitors initially set and then it fails a while later. It's inspectable initially which I guess is good, but I definitely want to get this fixed. Perhaps I should look to a vacuum leak, but then why would it only be on one side?