[QUOTE=Trevor;651947]In conjunction with others I do know, having gleAned what was originally posted.
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What was originally posted was incomplete without the codes. So only code listed that I could find was P1151 which could be alot of different things, however I would personally like to know the code that is coming up. I don't understand why the mechanic just cleared it the second time and didn't bother to check anything. Thats usually a 1 hr min. charge for labor or a diagnostic charge. Also it really depends on what they did for the other $2k worth of labor to know where they were messing with stuff. So what you should have gleAned is not enough info.
Subaru Specific Codes OBD-II OBD2 (1996 & newer)
P1130 Front oxygen sensor circuit malfunction (open circuit)
P1131 Front oxygen sensor circuit malfunction (short circuit)
P1134 Front oxygen (A/F) sensor microcomputer problem
P1137 Front oxygen (A/F) sensor circuit range/performance problem
P1139 Front oxygen (A/F) sensor #1 heater circuit performance/range problem
P1150 Front Oxygen Sensor Heater Circuit High Input
P1151 Rear Oxygen Sensor Heater Circuit High Input
P1151 OBD Trouble Code:
What does that mean?A Heated Exhaust Oxygen (HO2S) sensor indicating lean at the end of a test is trying to correct for an over-rich condition. The test fails when the fuel control system no longer detects switching for a calibrated amount of time.
SymptomsYou will likely not notice any drivability problems.
CausesA code P1151 may mean that one or more of the following has happened:
Electrical:
Short to VPWR in the harness or HO2S
Water in the harness connector
Open/shorted HO2S circuit
Corrosion or poor mating terminals and wiring
Damaged HO2S
Damaged PCM
Fuel System:
Excessive fuel pressure
Leaking/contaminated fuel injectors
Leaking fuel pressure regulator
Low fuel pressure or running out of fuel
Vapor recovery system
Induction System:
Air leaks after the MAF
Vacuum Leaks
PCV system:
Improperly seated engine oil dipstick
EGR System:
Leaking gasket
Stuck EGR valve
Leaking diaphragm or EVR
Base Engine:
Oil overfill
Cam Timing
Cylinder compression
Exhaust leaks before or near the HO2S(s)
Possible Solutions:See the above list of causes and go from there.