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Old 08-15-2011, 11:55 PM   #1
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Default p0171 p0106 p0506 DTCs...troubleshooting advice?

P0106 - Manifold Absolute Pressure (MAP) Sensor
P0171 - Fuel Trim System Lean
P0506 - Idle Speed Low

I've seen posts saying that P0171 points to a clogged or dirty injector problem, but that wouldn't explain P0106. I can't hear any intake leaks, what is the best way to test for those? Are these engines prone to vacuum leaks at any certain locations (injector seals, intake, etc.)?

It isn't the MAP sensor, I swapped sensors and throttle body with another 2.2L and the problem stayed with my car, the other one kept running normal. Operation is normal, it never dies and seems to run fine. I just installed new plugs and a new fuel filter (120k miles) which had no effect.

Does anyone have the system troubleshooting steps for P0106? I found the steps for P0171 and it refers to P0106, which leads me to think I may find the answer in the P0106 troubleshooting routine.
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