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Discussion Starter · #1 ·
1998 Mustang GT - Got a check engine light this morning on the way to work. Stayed on continuously. Restarted engine and light stayed on.
Plugged in my OBDII tester tonight and got the code - P1151.
I erased the code and drove the vehicle for 45 minutes.
No more CEL and when I retested it, I got a "PASS - no codes".

So what happened?

Thanks,
Ryan
 

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P1151 Lack Of HO2S1 Switches, Lean (Bank 2, Sensor 1)
P1157Lack Of HO2S2 Switches, Lean (Bank 2, Sensor 2)

These codes usually do not indicate a problem with the O2 sensor. Rather, the O2 sensor is correcting rich due to an overly lean air/fuel ratio.

Check Base Engine Idle, EGR, Fuel System and Air Induction System.
Bank 2 refers to the bank of cylinders opposite Cylinder #1.
Sensor 1 refers to the O2 sensor closest to the exhaust manifold.
Sensor 2 refers the O2 sensor downstream of the catalytic converter.
 

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Discussion Starter · #3 ·
Thanks for the clarification.
So by your information, am I to understand that the O2 sensor on the driver's side near the exhaust manifold was correcting a lean condition and triggered the Check Engine Light?

Here are my questions for anyone -
1. Does this mean the O2 sensor may need to be replaced?
2. Could my MIL Eliminators have anything to do with this problem?
3. Since I erased the code and drove the car, no lights came on. Does this mean it is fixed or will it need a few more cycles to trigger the light again?
4. The only way it could be a lean mixture could be the timing. I installed a timing adjuster and have it set to 16*. Could this be a factor?

Thanks for the help.
Ryan
 

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Discussion Starter · #4 ·
Think I've solved the problem.
Set the timing back from 16 degrees to 14 degrees.
Also checked the strap on a spark plug. It looked lean.

After 2 weeks of driving, I'm happy to report no further problems and car seems to run better.

cheers,
Ryan
 
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