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CODES P0172, P0175

Old 04-06-2008, 09:57 AM
Thread Starter
Join Date: Feb 2008
Posts: 48
Default CODES P0172, P0175

Just did an engine swap 2001 2.7 replaced it with the 2.7 out of an 2004 The car runs great but I keep getting these codes. p0172 p0175.I replaced the 2 upstream 02 sensors, cleaned the map sensor, did a smoke test on the intake and nothing leaking. The engine I took out had 76,000 miles and the one I put in had 16,000. When I do the readiness codes on my scanner it reads 02 and evap incomplete. The voltages for the map and tps are good
Old 04-06-2008, 12:33 PM
Senior Member
Join Date: Apr 2008
Location: Northern California
Posts: 278
Default RE: CODES P0172, P0175

Possible EGR problem.
Possible O2 sensor problem (Do you have 4?)

Does it run too warm? Or perhaps ping a little? (Lean conditions)
If so, the O2 sensors are likely. (The codes say it's rich, causing the computer to put in less fuel)

Does it run rich? (Heavy sweet exhaust smell when fully warm) If so, the TPS is still suspect.

If it runs perfect then the only real problem isn't too much of a problem (yet). It will present in how the vehicle runs eventually.

Most likely the downstream O2 sensors.
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