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    Thread: 2001 1.8t Wagon - PO112 check engine

    1. Member CajunSpike's Avatar
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      91 Burgundy Etienne(2), 92 Green Carat, 99 Passat Sedan, 06 2.5L Jetta
      08-06-2012 12:31 AM #1
      Bought a wrecked 2001 Green Passat wagon with 1.8t in it.

      Have all the accident damage fixed...engine is running again.
      Last issue to solve is PO112 check engine light.

      I know its intake air temp sensor...replaced it with new. After a bit, light comes on again.
      Replaced air filter...reset...light comes on again.

      Went to change the MAF just in case, but the one I got out of a junkyard passat has a different electrical connector(from a 99), so I can't use it.

      What other things can I check to clear this code?

    2. Member passatv6AF's Avatar
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      08-06-2012 01:22 AM #2
      Make sure everything is connected to the right connector

    3. Junior Member (Batman's Avatar
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      79 Rabbit 1.5 Diesel, 98 Passat 1.8T
      08-07-2012 12:11 AM #3
      you have a million cars... Do you have another 1.8T??

      If so, take the MAF out and pop it in this one.

      If it runs properly/No Check Engine light returns... Mission accomplished

      If you don't have access to another MAF, you may want to buy one.

    4. Member CajunSpike's Avatar
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      91 Burgundy Etienne(2), 92 Green Carat, 99 Passat Sedan, 06 2.5L Jetta
      08-07-2012 12:55 PM #4
      I went to the junkyard and pulled a MAF from a 99 wagon with 1.8t. Unfortunately the electrical plug is different on the 99 MAF and this 2001 car...couldn't use it.

      I don't mind buying one if that fixes the problem...just knowing that this is the possible cause is the biggest thing i needed.

      Awesome..and thanks.

    5. Member scotts13's Avatar
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      08-07-2012 01:52 PM #5
      I'd worry less about the MAF and more about the IAT, which is what that code is about. Specifically, since the car has accident damage, verifying the condition of the leads from the IAT to wherever they end up.

    6. Member CajunSpike's Avatar
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      91 Burgundy Etienne(2), 92 Green Carat, 99 Passat Sedan, 06 2.5L Jetta
      08-07-2012 03:02 PM #6
      I bought a brand new IAT and installed it. Cleared code, but it returned.

      On the 1.8t, the sensor is on the intake manifold on the drivers side of the engine, close to the antifreeze reservoir.

      The accident damage was a high hit folding the hood and cracking the plastic carrier. The fan hub on the motor was bent along with both radiators. Radiators were not punctured that I know of.

      No other parts of the engine were damaged or impacted.

      I will trace the IAT lines on the off chance something got pinched..good idea.

    7. Member CajunSpike's Avatar
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      91 Burgundy Etienne(2), 92 Green Carat, 99 Passat Sedan, 06 2.5L Jetta
      08-11-2012 06:42 PM #7
      Solution found(hopefully)!

      After much net research, I came across a case similar to mine.
      That guy found that two identical wires were plugged into each others socket.

      I went look at the 99 passat.
      There were two wires coming out of the harness in a common sheath. One went to the
      throttlebody and one went to the iat sensor. It was a black plug wire going into a black IAT sensor.

      Checked the 01 passat.
      There also were two wires coming out of common harness. One went to the throttlebody
      but the other did NOT go to the IAT. Followed the second wire...it was a black plug. Removed it and found it was attached to a green sensor under the intake manifold.
      Well, the wire plugged into the IAT was a green plug also. Removed the green plug from the IAT plugged it into the green sensor under the manifold...took that black plug from under the manifold and connected it to the black IAT.
      Cleared code.
      Started car....no code. Turn off...turn on motor. At this point, thats when the check engine usually lit up. No check engine. Cycled the motor on/off several times, no check engine.

      Fingers crossed and hoping..but I think I'm calling this fixed!

      Pic of the beast in question....


      After finding the right color hood.
      Also that center silver rub strip has been pulled and its a green rub strip.
      Going to put on the lower plastic after paint.

    8. Junior Member (Batman's Avatar
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      79 Rabbit 1.5 Diesel, 98 Passat 1.8T
      08-15-2012 01:28 AM #8
      right on

      Congrats

    9. Member CajunSpike's Avatar
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      91 Burgundy Etienne(2), 92 Green Carat, 99 Passat Sedan, 06 2.5L Jetta
      10-03-2012 02:38 PM #9
      Made more progress on the wagon.

      fixed rear hatch power lock. The motor that locked/unlocked the hatch was jammed. replaced it.
      replaced broken door pulls. Previous owner had broken some off.
      replaced master control switch on door. some buttons works, some didn't.
      replaced 4 way flasher switch. turn signals began to fail.
      pulled off damaged front bumper plastic. Installed freshly painted bumper plastic.
      replaced stripped rear wheel hub. 3 of 5 lug nut holes were damaged.
      replaced MAF. this fixed p0171 check engine code.

      Left over accident damage. Hood is replacement, due to be repainted/fixed.

      Close up of damaged spot. The plastic is split open about 7 inches or so.

      New paint is always so nice!

      voila..back to pretty again! Still need that grille part, bottom left. Where can I find one?

    10. Member CajunSpike's Avatar
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      91 Burgundy Etienne(2), 92 Green Carat, 99 Passat Sedan, 06 2.5L Jetta
      10-03-2012 02:42 PM #10
      Quote Originally Posted by passatv6AF View Post
      Make sure everything is connected to the right connector
      This person wins the award for getting the answer to the PO112 exactly right...as it turns out.


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