The most common turbo-related fault codes
- P0299 – turbocharger underboost
- P0234 – turbocharger overboost
- P2563 – turbo boost control position sensor / actuator problem
- P0045, P0046 – boost control solenoid circuit problem
- P0236, P0238 – boost pressure (MAP) sensor range/high
- P0101 – mass air flow (MAF) sensor out of range
It isn’t always the turbo
Many problems that look like a “failed turbo” are actually something else: a split boost hose, a loose clamp, a leaking intercooler, a cracked vacuum hose, a faulty N75 solenoid, a dirty MAF sensor, a blocked DPF or a stuck EGR valve. These faults cost far less to fix than a turbo repair.
Good diagnostics look at the whole system – from the air filter to the exhaust. So if the turbo really has failed you’ll know the cause too, and if it hasn’t, you won’t pay for a repair that doesn’t fix the problem.
What you can check yourself
- Whether there is oil or damage on the boost hoses
- Whether there is shaft play (engine off and cold, with the intake hose removed from the compressor)
- Engine oil level and condition
- Air filter condition
Frequently asked questions
How long do diagnostics take?
Computer diagnostics and the basic checks are quick. More complex cases may need a road test or removal of some hoses.
Should I clear the fault codes before coming in?
No. Leave the codes in memory – they contain information that helps us find the cause.