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Old 09-25-2011, 16:56   #1 (permalink)
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Question OBDII P0455\P1151 Help

Hello Ford Folks,
I have a 2002 Crown Victoria that has been giving me some issues. Ive notice while driving @ 55-80MPH that the car would lightly sputtering when I would apply more gas. The CEL pops up and P1151\P0455 would pop up. I have replaced the fuel pump\fuel filter\crank sensor. I have also cleaned the MAF. Im fresh out of ideas, can anyone point me in the right direction please?
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Old 09-25-2011, 17:30   #2 (permalink)
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Re: OBDII P0455\P1151 Help

Here's what they mean.
OBD-II Trouble Code: P0455 Evaporative Emission Control System Leak Detected (no purge flow or large leak)
If the gas cap is on and good, then there's a problem in the evap system. That can, but not necessarily, cause the P1151.
OBD Trouble Code: P1151 Lack of HO2S-21 Switch, Sensor Indicates Lean
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Old 09-29-2011, 01:32   #3 (permalink)
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Re: OBDII P0455\P1151 Help

@Bert

So I bought a new fuel cap and I dont get the P0455 code anymore just the P1151, Im not sure where to start, maybe the sensor is bad and needs to be replaced? If that is the case where is this sensor located\will it be a easy removal-install?

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Old 09-29-2011, 20:04   #4 (permalink)
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Re: OBDII P0455\P1151 Help

There could be one of many problems listed on that site. Have you checked for fuel presure regulator? If the vacuum line is off or leaking to it, that can cause that too. Try with the MAF unplugged to see what it does.
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Old 10-11-2011, 17:43   #5 (permalink)
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Re: OBDII P0455\P1151 Help

@Bert

So I unplugged the MAF and car was shaking hardcore like it wanted to die and used up a lot more fuel than normal. I only took it to a short trip to the corner with it unplugged, then I plugged the MAF back in and cleared the code but they both came back. What are your thoughts?
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Old 10-11-2011, 18:03   #6 (permalink)
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Re: OBDII P0455\P1151 Help

If it ran good unplugged, the MAF would have been causing some trouble. With the P0455, there's a major problem in the evap circuit. I'd be looking at all of the hoses and evap canister first.
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