5 /5 Dylan Stevens: Pioneer Brake & Auto Repair is definitely the place to go to. This place is ran by very knowledgeable guys. They helped me diagnose my express van and figure out why this check engine light was on. Matt ran a smoke test to check for vacuum leaks, checked my fuel pressure, and looked at my fuel intake levels on the scanner. Very thorough diagnosis indeed. They found it to be the mass flow sensor Jerry told me to go with the OEM sensor, which of course I didn’t because of lifetime warranty from AutoZone. Still had a few problems, finally went with OEM and drives like brand new. Thanks guys