497D

What Code 497D Means

Code 497D indicates that the exhaust gas pressure sensor before the turbocharger is sending incorrect data. This sensor measures exhaust gas pressure ahead of the turbine and sends the signal to the engine control unit (DME) for load calculation and boost control.

Possible causes: a faulty sensor, a contaminated sensing element, or wiring problems. The system sets the fault when the signal falls outside the allowed range or becomes implausible.

Symptoms

• Instrument cluster: Check Engine light comes on.
• Engine: reduced power, rough running.
• Vehicle behavior: possible hesitation or flat spots under acceleration.

Diagnosis and Repair

1. Read the fault codes with diagnostic equipment (ISTA, INPA) and check for related errors.
2. Check the exhaust gas pressure sensor: inspect for contamination, check the electrical connectors and wiring integrity.
3. Check the wiring: make sure there are no opens, shorts, or corrosion in the sensor circuit.
4. Replace the sensor if a fault is found or if it's heavily contaminated.

Tools needed: diagnostic scanner (ISTA, INPA), multimeter for checking circuits.

Secondary Problems

Running for a long time with a faulty exhaust gas pressure sensor can lead to incorrect turbocharger control and, as a result, higher fuel consumption, reduced power, and possible damage to the turbocharger or catalytic converter from an incorrect mixture.