P0119 Code - Engine Coolant Temperature Circuit Intermittent

What Does P0119 Mean?

P0119 is the generic OBD-II code which indicates that the Engine Control Module (ECM) has detected intermittent ECT sensor input.

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What are the common causes of P0119 ?

• Some aftermarket accessories and performance modifications
• A faulty oxygen sensor. This will set a code in itself, however, a faulty oxygen sensor does not automatically condemn the sensor. The code just means that the sensor signal was not within specifications. An air leak or any of the above will cause an erroneous signal. There is a multitude of O2 codes relating to O2 performance which gives a clue to the problematic area.
• Faulty IMRC actuator/sensor

What are the symptoms of P0119 ?

• MIL (Malfunction Indicator Lamp) [Check-Engine Light) illumination
• Poor fuel economy
• No start condition
• Poor fuel economy and a possible-rich DTC (diagnostic trouble code) can be caused by a defective ECT sensor, high resistance in the sensor wiring, or a disconnected sensor. ECM/PCM is looking for a change in voltage.
• Engine may run rough or blow black smoke out the tailpipe
• Vehicle starts, runs very poorly, running very rough and misfiring

How do you troubleshoot P0119 ?

Like the all engines, the car engine system employs specially developed hydraulic lifters (known as switching roller followers) for the P0119 code intake and exhaust valves. The lifters can be collapsed by disengaging an internal locking pin. The locking pin is disengaged using solenoids to alter oil pressure fed into the lifter.

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