"New" does not equal "Good"

Written By - John Griffen, Diagnostician

Diagnosis is a challenge for any shop. Sometimes things can get even more complicated by a previous repair, or a part that has been recently replaced. This case involves both of these scenarios. After all, we really want to believe that a new part is a good one, right?

The 2005 Ford Freestar arrived to my bay with 120k miles on the odometer and a complaint of intermittent neutraling and shifting issues with the transmission. A quick pre-road test inspection revealed brown and varnished transmission fluid. Although there was no check engine light on, there was a code stored in memory, P0340. This code is for a camshaft position sensor fault. I wasn’t too concerned with the code itself; the customer had reported that this sensor had been previously replaced by another shop, so it was possible that the technician had forgotten to clear the codes after the repairs. A visual inspection revealed a very new-looking cam sensor.