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Old 02-10-2012, 21:18   #1 (permalink)
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confused 2002 Explorer 'O/D OFF' light flashing, code P1151

Hello,

I've had a problem for a while with my SUV. It's a 2002 Ford Explorer XLT 2WD. It seems to drive without issue. Between about 2-11 miles worth of driving, the 'O/D OFF' lamp begins flashing steadily. It will continue flashing until the car is turned off. The 'Service Engine' lamp does not come on. When you start the car again, the 'O/D OFF' lamp is not lit.

I hooked up an ODBII reader and was able to get some information from it. It gave me code P1151, and this was the only code it gave me. I am concerned that the presence of this code will not allow me to pass a smog check (California). My ODBII reader also gave me some extra information relating to that code -- I can provide if it is useful.

What do you think it might be? What should be my first step in further diagnosing and repairing this issue? I am not very experienced when it comes to cars but I am willing to give it a shot.

Thank you for any assistance you may be able to provide!!

JC
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Old 02-11-2012, 08:02   #2 (permalink)
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Re: 2002 Explorer 'O/D OFF' light flashing, code P1151

The overdrive light would have nothing to do with the P1151. This is what it shows for P1151 OBD Trouble Code: P1151 Lack of HO2S-21 Switch, Sensor Indicates Lean
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Old 02-11-2012, 17:00   #3 (permalink)
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Re: 2002 Explorer 'O/D OFF' light flashing, code P1151

Hi Bert,

I appreciate your response. I'm not sure why you would say that the P1151 code would have nothing to do with the O/D OFF light. P1151 is the only code that is thrown off. I've seen that article you linked and it states that a potential issue could be an 'Open/shorted HO2S circuit' or 'Damaged HO2S'. I have also seen others resolve this issue with a replacement of the HO2S-21 sensor. If this is not correct, what should be my next step in troubleshooting this issue?

Thanks in advance,
JC
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Old 02-11-2012, 17:26   #4 (permalink)
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Re: 2002 Explorer 'O/D OFF' light flashing, code P1151

It could be any one of the items listed on that link. The sensor could be bad but so could the other things shown. Use that list and check each one. You could start throwing parts at it but that can be costly.
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