P0139, P0172, and P0234

jsmith

jsmith

Silver Member
Greenie N00B Member
Greenie Member
Codes are:
P0139 - 02 Sensor Circuit Slow Response
P0172 - Fuel System too Rich
P0234 - Engine Overboost Condition

I am guessing its the MAF, as the STFT/LTFT readings suddenly jump to/from large and static values.

Cold start idle log is attached.

Any input, or past experiences with similar issues would be appreciated.
 

Attachments

If you hold the throttle a bit while cranking to bypass the cold start routine, do the codes appear again?
 
The cold start routine is pretty neutered via the tune.
I'll give it a try, but so far the codes have reappeared across battery pull resets.
 
Did these just pop up out of no where or did something happen? How does it drive. It may be the rear o2.
 
Was pretty sudden. Car drove well enough before I parked it for a month or so. Car drives well enough as long as no WOT.
 
Turn those emission codes off. You're a Floridian.
 
No reason, just being stupid.

With the issues that you and Raider are having, I wonder if I should change mine for good measure....
 
There is a good chance my car passed on an extra demon to possess your Speed.
 
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