Http://www.obd-codes.com/p0118 The engine coolant temperature (ECT) sensor is a thermistor screwed into a coolant passage in the cylinder head. Sensor resistance is high when coolant temperature is low and resistance drops when coolant temperature increases. The powertrain control module (PCM) provides a 5 volt reference and a ground to the sensor. The PCM monitors voltage drop to determine coolant temperature. If the ECT reads less than freezing temp. when engine has been running for more than a few minutes, the PCM determines a circuit fault and sets this code. Or if the PCM determines the sensor resistance is out of specs, this code is set. Symptoms of a P0118 could include: A code P0118 may mean that one or more of the following has happened:
What does that mean?
Potential Symptoms
Causes
SOURCE: Code P0118 on Audi A4 - Related to Ignition Coil Problem?
Hi, the sensor on the engine (right at the rear end of the cylinder head) has two separate outputs. One drives the temperature gauge and the other provides data for the engine control unit. The output for the engine control unit is almost certainly faulty and the sensor will need to be replaced. It isn't an expensive item and's not time consuming to replace (1/2 hr) - so you could ask Audi to do it for you when they replace the ignition coils.
Hope that helps Matt..
SOURCE: Wont pass emissions code p0118
This code indicates a high voltage from the ETC, the engine coolant temperature. Supposedly a high voltage means a low temperature. Try to disconnect/ reconnect the battery a few times; this should clear the code. If the code returns, it is most likely the sensor. This should have nothing to do with the emmisions. If that's the only code, then the emmisions problem could be catalytic converters, O2 sensors, fuel injectors, could need a tune up, etc... usually emissions problems have to do with poor fuel burn-off.
SOURCE: 97grand am code P0118 replaced ect sensor clear
Engine coolant temperature (ECT) sensor is a thermistor screwed into a coolant passage in the cylinder head. Sensor resistance is high when coolant temperature is low and resistance drops when coolant temperature increases. The powertrain control module (PCM) provides a 5 volt reference and a ground to the sensor. The PCM monitors voltage drop to determine coolant temperature. If the ECT reads less than freezing temp. when engine has been running for more than a few minutes, the PCM determines a circuit fault and sets this code. Or if the PCM determines the sensor resistance is out of specs, this code is set. The reference values given below are measured between ECM terminal 72 and ground... When measuring input / output voltage be careful not to use ECM ground terminals. The ECM will enter fail safe mode once a malfunction is detected and the MI will light up.
Usually, P0118 is indicative of a bad temperature sensor, but doesn't
rule out these other possibilities. If you're unsure of how to diagnose a PCM,
do not attempt.
Keep us updated.
SOURCE: the engine wont start once hot
mine doing same, we think some how maybe vaccume hose, or vapor lock. Every time we fill up. No other time. Have you found a solution?
SOURCE: sluggish start or wont start P0118
Code is for coolant temp high.
It may be as simple as jjust replacing the coolant temp sensor, although check the harness for damage first and repair.
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