knock sersor on 2003 Ford F-250 Super Duty

how do you check if a knonk sersor is bad do you need to take off the maniflod to do it thank tou

by in Warminster, PA on March 02, 2011
2 answers
ANSWER by on March 02, 2011
The only method that I know how to diagnose a knock sensor is to monitor the sensors output with a capible scan tool while operating the vehicle. I habe seen failures of the knock sensors from a rodent that has crawled under the intake and chewed into the wiring.
ANSWER by on March 03, 2011
Standard knock sensors can be tested by tapping near the sensor and checking timing on a scan tool,Or you may hear an rpm change.Pezoelectric knock sensors cannot be tested the way.