My service eng light came on the mechanic said the code was knock sensors changed both knock sensors and harness all new and the next day the light came back on with the same codes bad knock sensors we found that one of the knock sensors reading was way to high should of been .599 but it was reading 3.0 so we changed the one knock sensor and but it back together and again service engine light came back on I haven't got the codes yet but i bet it has the same codes