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I had the same problem with my expedition P136 and P156 code came up. I did research and both codes they are for the O2 sensor but if both codes come up replace the Vacuum line from the PVC value on top of the value cover to the back of intake platuim. The other 2 codes are also for the O2 sensor change check and or replace vacuum lines this was my problem and saved me over 200.00 best of luck. OH yeah the vacuum line is hard to find.

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Q: How do you repair codes P136 P156 P1131 P1151 on a Ford Expedition XLT?
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