moserbe

Just got this code a little while ago. The car was running fine, no problems. I looked up the code and all that it says is H02S transition time ratio. WTH does that mean. I cleared the code, started the engine and it didn't return....so far. Appreciate any and all help. Thanks.

Optimus_C5

Here's some information on the code. Hope this helps you troubleshoot it.

P1151 OBD Trouble Code
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Technical DescriptionLack of HO2S-21 Switch, Sensor Indicates Lean

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.

Causes A 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.

moserbe

Thanks Marc, I appreciate your help.

moserbe

Put it on the laptop tonight and found that one of the rear O2 sensors is locked on 92.2 and not flucuating as the other 3 sensors are. This might be the problem.