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You are right. I am living in Vancouver. This car only has 120k KM. There are so much oil inside the engine, so last year, because of the limp mode, it was on fire.

Thank you. this is a 2001 Audi a4 1.8T in Canada. so "The wastegate may be physically stuck shut, or the mechanism that controls it is." may be the reason?

Thank everyone for every serious reply, especially to you. I am a new user here so it caused everyone to be troubled by this situation.

2001 Audi A4 1.8T

If the actuator doesn’t work, the n75 value is 0? video Here is the record, Maybe the oxygen sensor also has a problem.

The VCDS shows 'boost pressure control(N75)' values is always 0, the "boost pressure(actual)" and "boost pressure(specified)" value didn't change with the engine speed . so this means I need a new N75?

Thanks. I have checked the N75 and associated vacuum tubing.it's ok. So air leak is not the reason for "P1555 - Boost pressure Control: Upper Limit Exceeded" ? The pressure cannot be discharged, so the pressure is too high, rather than the leakage of the pipeline, which needs to be supplemented？

Thanks for your response. Two months ago, When I derived the car the engine light was on, and the engine passenger side has caught fire. I guess the reason is the high temperate in the three-way catalyst and some oil upon it. After this accident, I replaced MAF, the oxygen sensor. Today the same...

I have bought this car last year. Yesterday when I derived it nearly 10KM, step on the accelerator but kept nearly 2000. I stop and restart, the accelerator is working, but when I derived 2km, the situation happened again. After the next day, when I start the car, some smoke comes near the...

Hi, have you solved this problem?