ECM codes P0174 and P0153

Tiny
KNIGHTSCHARIOTS
  • MEMBER
  • 2001 FORD ESCAPE
  • 3.0L
  • V6
  • 4WD
  • AUTOMATIC
  • 303,000 MILES
Intermittent DTC P0174 unconfirmed by computer and scan tool. A consistent confirmed DTC P0153 smoke tested the engine since last Question was asked and have found EGR valve leaking smoke at valve body vent holes. With test being performed.I believe it should be closed and not leaking from what I have read.I think its stuck open and intermittent close/open with the lean code P0174 as it goes away then returns at fuel up or sometimes driving haven't had a chance to remove her and check for carbon build up. I also think the o2 sensor is fine after graphing it and snap throttle they all show with in acceptable range. Recent scan tool freeze frame data is as follows. Fuel sys1 clsd ( calc load % 31.8(coolant temperature 176 (engine RPM 1597( vehicle speed 25 mph ( STFT1- 0.8 ( LTFT1 - 5.5 ( STFT2 -16.4 (LTFT2- 24.2. Do you think EGR causing P0174 Intermittent and the P0153? I'm going to change the EGR valve re-smoke test it and see if the P0174 goes away.I don't think the P0153 is a bad O2 sensor.
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Tuesday, August 18th, 2020 AT 10:52 PM

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Tiny
JIS001
  • MECHANIC
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When doing a smoke test, some smoke will escape out the EGR. If the EGR were stuck open you would get a hard start or a random misfire which in this case you have neither.

P0153 is a fault with the oxygen sensor on bank2 sensor1. Looking at your fuel trims you posted it appears bank2 is running really lean. I would recommend you look for an intake leak around bank2 or exhaust leak as well. If no leak then your upstream oxygen sensor on bank2 is the culprit causing these codes.

But as stated earlier, verify you have no intake or exhaust leaks near the oxygen sensor. Let us know what you find please.

Check out the diagrams (below). Please let us know what happens.
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Tuesday, August 18th, 2020 AT 11:42 PM
Tiny
KEN L
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I have seen the EGR passages get clogged up so when you have the valve off please check for carbon build up. Let us know.
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Wednesday, August 19th, 2020 AT 6:12 PM
Tiny
KNIGHTSCHARIOTS
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Update: Ken in inspecting the EGR there was a large amount of carbon buildup in the hole of the EGR tube. That was part of the issue.
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Monday, May 24th, 2021 AT 2:32 AM
Tiny
KEN L
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Yep, the EGR passages need to be clean to allow gases to flow freely. Let us know what happens and please upload pictures or videos of the problem.
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Tuesday, May 25th, 2021 AT 10:46 AM

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