P1299 - FAULT CODE - OBD2

POST UPDATED IN January, 2023

P1299 Code failures by brands

P1299 FORD, LINCOLN, MAZDA, MERCURY: CYLINDER HEAD TEMPERATURE SENSOR DETECTED ENGINE OVERHEATING CONDITION

Description of DTC code P1299

The cylinder head temperature sensor (CHT) is an electronic device that is part of the engine management system, and its function is to measure the temperature of the engine’s cylinder head. The temperature is a very important factor involved in the engine’s performance and is one of the parameters used by the ECM (Engine Control Module) to determine the time and fuel needed to achieve greater engine performance. This sensor is essential in engine management, taking into account that the readings it provides are critical for engineering calculations.

Fault code P1299 OBDII is set because the cylinder head temperature sensor detected an overheating condition, which is caused by multiple factors.

It is important to note that if you find that the temperature gauge is set to red, you should stop the engine as soon as possible to allow it to cool down and avoid further damage.

Symptoms of fault code P1299

  • Check Engine lamp on.
  • The starting time of the engine is long.
  • General engine performance failures.
  • Difficulties in acceleration.
  • Lower fuel efficiency.

Causes of OBD2 P1299

The reasons for setting the diagnostic code P1299 OBD2 are

  • The thermostat may be damaged.
  • The engine may not have enough coolant.
  • The wiring of the Cylinder Head Temperature Sensor may be deficient.
  • The cylinder head temperature sensor may be defective.

Possible solutions of the DTC code P1299

The steps to solve the DTC code P1299 OBDII are the following:

  • See the Technical Service Bulletins.
  • Check the operation of the thermostat. If you find that it is damaged, make the necessary corrections, including replacing it if necessary.
  • Verify that the amount of coolant available to the engine is adequate for good performance. Check that there are no leaks from the engine.
  • Check the wiring of the cylinder head temperature sensor and check it for common damage. Also, measure the circuit voltages of this sensor and compare them to those indicated in the service manual. Repair if you discover any inconsistencies.
  • Check the cylinder head temperature sensor for integrity. Replace it if you detect any damage to it.

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