If at this point the vehicle is still setting the same code, you may have a more serious problem with your car’s oxygen sensor system, and you should bring the vehicle to a certified shop to have further diagnostic work performed. If your ECT did not meet the above criteria then the sensor is faulty and needs to be replaced. If the sensor passes the above tests, then you may have a wiring concern or in very rare cases have a faulty ECM. As the temperature goes down the resistance should up. As the temperature goes up the resistance should go down. Now remove the hair dryer and watch the resistance values. If there is no disconnection in the wires and the coolant appears good and to not have any air pockets, remove the coolant temperature sensor and check the resistance of the sensor. At roughly 70 ☏ the resistance should be approximately 2.5kV. Use the hair dryer to increase the temperature of the sensor. If the test shows an open circuit or high resistance, repair the wiring. You should have continuity and low resistance. Check the resistance of the wires from the ECT sensor to the ECM. STEP 3: INSPECT WIRING.ĭisconnect the ECT sensor and check the circuit wiring for fraying or disconnection. If you find either, flush, and bleed coolant system. STEP 2: INSPECT COOLANT.Ĭheck cooling system for air pockets or dirty/rusty coolant. ![]() If other codes are present, they must be addressed first. ![]() Scan your vehicle to verify P0118 is the only code present. STEP 1: USE FIXD TO ENSURE NO OTHER ENGINE CODES ARE PRESENT. Tools/parts needed (our top picks from Amazon): This repair can be attempted by beginner DIYers. Complete diagnosis may require some specialized equipment beyond what the FIXD Sensor can provide, but for the most part, this diagnosis and repair can be attempted by beginner DIYers. If you’d like to try to fix code P0118 at home without throwing money at parts, you’ll want to follow the steps below for proper diagnosis.
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