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.

 

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

P1151 OBD Trouble Code
NOTICE: The information contained on this site is presented for information only. OBD-Codes.com is not responsible for any actions you take on any vehicles. If you have any doubt as to repairs on your vehicle, please contact a qualified technician.

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.

 

Thanks Marc, I appreciate your help.

 

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.