Diagnosis of Exhaust Gas Temperature Sensors

  • The MIL light is blinking (Malfunction Indicator Light)
  • Momentary lighting: A temporary failure has been detected. However, the failure needs no further attention, since it is not present permanently
  • Permanent lighting: An error has occurred and should soon be resolved (in a garage).
  • Quick lighting: A fatal error has occurred. The vehicle should be repaired immediately to avoid subsequent errors. Greatly reduce speed and load (acceleration) – In best case stop the engine.


All diagnostic error codes can be read with a diagnostic equipment tool. All codes start with a P. = P0001 to P0999

Related topics

Basic ignition coil principles: NGK explains the operating principle of an ignition coil

Design of an ignition coil: Information about the design of NGK ignition coils and the generation of high voltage through magnetic induction

The NGK ignition coil code: The item number in the NGK ignition coil range indicates which number stands for which type of ignition coil and thereby makes it easier to find the right ignition coil and ignition cables

Installation tips for ignition coils: The correct installation of an NGK ignition coil guarantees the optimal function and a long service life.

Distribution of the ignition spark: In the classical version a central ignition coil generates the high voltage necessary for the ignition of the fuel-air mixture.

Ignition cables: The ignition cables are responsible for conducting the voltage (U) to the spark plug with as little loss as possible.