: P0306 and P0300 codes CKP changed

01-12-10, 08:46 PM
This is on a 2000 Cadillac Deville the one with a coil for each cylinder (in 4 packs) and no spark plug wires. Six months ago I changed both of the CKP sensors (crankshaft sensors) due to codes that indicated they were faulty and the car would stop running. I do not have a Scan 2 tool and was unable to relearn the car. Everything worked without relearning for six months. Now I got P0306 and P0300 codes. The P0306 went away when I replaced the sparkplug in cylinder 6. Now just P0300 and a definite miss or running rough. Is it possible that the engine would run fine for six months after the CKP replacement and then post P0300 codes? I hate to go to the dealer. Any suggestions would be greatly appreicated.

01-12-10, 09:46 PM
How many miles? If one plug needed changing, I'd have change all of them.