Codes P0174 and P1151

2001 FORD ESCAPE
304,000 MILES • 3.0L • V6 • 4WD • AUTOMATIC
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KNIGHTSCHARIOTS
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Have an ongoing p0174 and p1151. I also have a buzz sound when depressing the accelerator pedal. I isolated it to the circuit in the power distribution box (INJ30 fuse). When removed the buzz stops . what all is on this circuit? is there a wiring diagram and pin out for everything on the INJ30 circuit ? Also the exhaust seems low output for pressure not sure if it's a possible plugged catalytic converter causing the p0174 lean code and low voltage 1151 for bank 2 the oxygen sensors on bank 1 and 2 upstream are new sensors. No vacuum leaks detected in system. Could the EVR cause the p0174 and P1151 ?
Oct 22, 2020 at 8:07 AM
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ASEMASTER6371
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Good morning,

The 174 is a lean condition on bank 2.

https://www.2carpros.com/articles/repair-lean-mixture-codes-p0171-or-p0174-on-some-manufacturers

Very common failure for this is low fuel pressure. Test the pressure to be sure. I attached the pressure below.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

https://www.2carpros.com/articles/how-to-test-engine-compression

The 1151 is also for lack of fuel. The sensor is not switching from the lack of fuel.

We can only deal with one issue at a time as per site rules.

Please start a new question for the other concerns and I will be glad to help

Roy



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Oct 22, 2020 at 8:32 AM
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BMDOUBLE
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The intake gaskets on these are extremely common at my dealership. The easiest way to verify this is to pull up the o2s21 and o2s11 pids on your scanner, then while the engine is cold (first start) spray the lower intake area while looking at the voltage on your scan tool, if it spikes up when you spray, bobs your uncle=intake gaskets and you're done. Here are some images that should help you.
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Oct 22, 2020 at 9:14 AM
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KNIGHTSCHARIOTS
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BMDOUBLE all of the upper and lower intake gaskets have been Changed prior to this issue .It was the first thing changed out when this problem started.
Oct 23, 2020 at 1:45 PM
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ASEMASTER6371
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Did you check the fuel pressure yet?

Roy
Oct 23, 2020 at 1:50 PM
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BMDOUBLE
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Like Roy said, fuel pressure test.
Oct 25, 2020 at 4:40 PM