Mt Power Chiangmai (DynoJet 4WD)

MT Power is a car workshop on Mahidol Road in Pa Daet. It's run by a couple, and the owner communicates in English. Beyond routine servicing, it does ECU remapping and runs a dyno for performance testing, which is unusual for a garage this size. There's a waiting room while the work is done. It's a useful option if your Thai doesn't stretch to explaining a fault, though for bigger jobs it's still worth getting a quote first.