Changed coolant sensor and thermostat. Still getting code and won't clear. However I plugged another sensor with it unscrewed from the block and the fault cleared. Screwed that other sensor into the block and the code reappeared and wont clear again.
I'm not sure I understood all of your post? See the two wires at ect, key on, use digital multimeter, check for voltage at those wires. The ref voltage should be 5 volts as you can see map sensor shares one of those circuits.
You can do ohms test on sensor terminals, wiring connector not plugged. The resistance goes down as engine heats up. Sometimes air may get in system and cause problems?
SOURCE: changed coolant sensor on 99 monte carlo, cleared computer, light
Which coolant sensor did you change? The one in the passenger side tank in the radiator.
SOURCE: Hi, 2003 Beetle / reset - clear faults
Im actually going through the process of fixing this problem with my car. the P2181 is a performance cooling error, usually brought up by thermostat, radiator issues, or ECT sensor. You should narrow it down and check both radiator and thermostat to prevent later issues. If all is well go to your local autozone, pep boys, checkers..etc. and have them erase the DTC error. If you are looking for a more long term solution you can purchase many different software such as VAG-COM or any other software used to run test on vehicals. Be sure you know what you are doing though because messing with your cars computer can have long term effects that can be pricey.
SOURCE: i have a toyota rav4 2003 management light came on
The upper sensors are air fuel sensors and the lower ones are o2 sensors. you cant mix these up. Assuming you did everything right and still coding then either the new sensor b1s2 is bad or the wirng(power and ground need to be checked. A scan tool can be used to look at the performance of the sensors too. Sometimes the codes just point to the area of the problem and changing the part isn't the answer.
SOURCE: 2001 Chevy Impala code P0118 what does this mean?
The coolant sensor is bad,change it out,and bleed the air out of the cooling system,the cooling fans should come on on there own,and go off on there own,this is with the ac off.When the cooling fans do this,then it is cooling down correctly.If this was helpful,please rate,by the way,the overheating is most likely from the cooling fans not coming on,this is the reason,thank you,and please rate.
Testimonial: "Thanks will give it a try"
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.
The coolant temp sensor is #9 in the picture. How hot does it get in degrees F? Are the radiator fan/s running?
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