Fault
Stretched timing chain
Chain and sprocket wear allows the camshaft to fall out of phase with the crankshaft.
Engine / drivability
Faults
Fault
Sticking throttle
The throttle plate or its actuator binds so the commanded and actual throttle positions diverge.
Fault
Worn turbocharger
Shaft bearing wear allows the rotating assembly to contact its housing and lets oil past the seals.
Fault
Stuck wastegate
The wastegate binds so boost pressure is either uncontrolled or never reached.
Fault
Blocked catalytic converter
The substrate has broken up or melted and now restricts exhaust flow.
Fault
Failing crankshaft sensor
The crank sensor signal drops out intermittently so the engine loses its timing reference without warning.
Fault
Failed air flow sensor
The sensor or its circuit has gone open so the control module has no airflow signal.
Fault
Dirty throttle body
Carbon around the throttle plate changes the effective idle airflow away from the learned value.
Fault
Failed fuel pressure regulator
The regulator diaphragm has failed so rail pressure is not controlled.
Fault
Fouled spark plug
Carbon or oil deposits on the insulator nose provide a conductive path that shunts the spark.