very intermittent check engine light

[Kevinl]

today and like 6 months ago the check engine light is on for a little bit while the car was warming up.

I did a stomp test and got a code 1223 for coolant temperature sensor

I found a receipt where the previous owner had the sensor replaced like 4 years ago

Does someone have the spec on what the resistance values are supposed to be on it.

could dirty injectors or bad 02 sensor be the culprit without throwing a code because those probably need to be changed?

Is motronic capable of detecting a misfire?

[Kevinl]

please move to M20 forum not sure wtf happend

[mpowerful]

Its in neighborhood of 2000-3000 cold and 200-300 hot.

The other things wont throw coolant temp code but could cause shitty running. Motronic cant detect a misfire.

[justin_l_]

Could be a wiring issue. If sensor is good, I would check the wire for wear and tear next.