Audi Repair Questions? Ask a Mechanic for Answers ASAP
Hello, I'm Brandon - VW tech.
P0299 - turbo under boost.
1. Check for any leaks in the turbo ducting between the turbo pressure side and the intake manifold. Code P0299 indicates the system is showing a low boost condition.2. Check for movement of the turbo wastegate actuator rod and verify the waste gate does not bind.3. Verify the turbo overrun shut off valve is not leaking boost pressure and that there is no vacuum present to the valve while under boost.
These engines can be very difficult to locate intake air/vacuum leaks on. The preferred method is to use a smoke machine and fill the intake system by disconnecting the air intake hose at the air filter. Once the system is full of smoke it may further help to locate a leak by using shop air regulated down to 5 PSI and pressurizing the air intake system. Note where there are in-line vacuum check valves and you will have to test that separately as the smoke will not pass these.
Most of the time is a bad turbo, loose turbo hose or intercooler.
The P0420 is catalytic converter efficient code. THis is due to bad catalytic converter. It needs to be replaced.
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You will need to use a smoke machine to pinpoint the air or vacuum leaks.
The Turbocharger Recirculation Mechanical Valve could go bad.
Also the Wastegate Bypass Regulator Valve N75
Have you check the diverter valve? They can have leak and it is common repair. They even have repair kit for them.
Yes, I would replace that diverter valve first.
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