I have replaced the sending unit because my temp gauge does not work and I am getting code 21 and 42. 21 is missing temp signal. I tested the gauge wire by grounding the wire to make the gauge read hot. New sending unit and old one did not make the needle move at all.
Could it be the sensor?
I am getting mixed messages about where the sending VS the sensor is. I believe the sending unit has one post on top with one wire pressed onto it. (Replaced it with no change on the gauge)
The sensor is bigger and has a gray wire clip on top of it. Looks like two wires running in and out of it. Does this sensor have anything to do with the gauge? Is there a test?
I am at a loss. I have read so many posts on so many different sites that I cannot tell how many sensors I should be looking for. I cannot find anything on the back of the engine.
have the same problem?
Saturday, April 18th, 2015 AT 9:40 AM