Question about 2003 Ford F150 Regular Cab

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I've got a 2003 F150 5.4L with 114K. Recently had the 100K service done at about 105K (plugs & boots, fuel system flush, coolent flush, tranny flush). Wife left for grocery store and said truck was idleing rough then check engine light came on. Only codes are P0155 and P1151. Both relate to "bank 2 sensor 1" O2 sensor, but the 1151 code has alot of other things that can cause this code. From what I've read, a simple bad O2 sensor shouldn't affect drivability. So this worries me since the engine actually seems to be running rough. Anybody have some suggestions or maybe have seen this before? Thanks

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Code P0155, 1155, will get those code's with vacuum leaks, I have seen that many times here at my repair shop, many times customers come in, after they have done a tune-up, as you have, and same problem, check for vacuum leaks, more so on top of engine to the back, by fire wall.

Posted on Sep 16, 2010

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