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Help With P1120 & P1122 Codes

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Hoping to gain some insight on codes P1120 & P1122.

I was driving my '03 Turbo today around town and noticed that the engine felt a little rough when I lifted the throttle. I then discovered that the car would make a max of 0.2 BAR of boost. The car has K16/16G turbos, a 5 BAR FPR, an exhaust, and an FVD flash. It typically makes a steady 1.2 BAR of boost, so something was definitely amiss.

I thought I must have a boost leak somewhere, so went home and did a quick pressure check. No boost leaks. I then got the code reader out and found the above mentioned codes. Note that the car never threw a CEL, despite the fact that I had driven it like this about 20 miles and had turned the car on and off a couple of times.

I think the P1120 code is "TP Sensor out of range low" and the P1122 code is for "TPS Sensor 2," but am not for sure. I also found a few other posts with these codes mentioned, but it appears that most of the folks suffering from these can't get their cars to run. After thinking about the max of 0.2 BAR of boost and the car's anemic feeling, I figured it probably was something to do with the e-throttle signal and/or the TPS.

With no other way of troubleshooting other than to check the TPS connector (which was good), I decided to re-flash the DME. The car now once again runs fine, there are no codes present (at least after a short test drive), and the car now makes normal levels of boost.

After the re-flash, I put my code reader on and checked the PIDs. The Throttle Position shows about 4% with no throttle, and 100% with the throttle floored. I assume these are about correct? I would also assume that if the PID is showing 100% throttle with the pedal floored, that if I have any more problems that the problem must lie with the TPS and not the e-pedal signal? Has anyone had any similar experiences, or had to replace the throttle body assembly due to TPS codes?

Any insight would be greatly appreciated.



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