The shop kept the car for nearly four days to diagnose codes; they offered me a "special" on the diagnosis, three codes for the price of two: total cost, $220 and they still didn't give me a clear indication of whether the car needed transmission work, a car with 202,000 miles on it that wouldn't shift to high gear. They did insist it needed new catalytic converters (about $5,000) and some sensors. The diagnosis was that the car was unable to shift because the nitrous oxide sensor was bad, it needed a thermostat for the cooling system, and new catalytic converters. They said that in concert these were somehow preventing the last shift. My personal mechanic told me he'd never heard of such a diagnosis. I took the car to another transmission shop; diagnosis was at no cost, they determined that yes, it did need a nitrous oxide sensor, but no codes appeared for the other functions AAMCO diagnosed. This second shop did say the car needed a transmission repair, $2,800, about what I expected. AAMCO bought, for $220, this negative review and my refusal to ever recommend them to anyone. Indeed, I would steer away from AAMCO anyone who asked for a reliable transmission repair shop.
This customer came to us with catalytic converter codes, other codes & NO TRANSMISSION CODES. Our diagnostic confirmed bad catalytic converters which had to be replaced before a proper transmission test could or SHOULD be done. The customer probably did need a transmission repair also, but the bad catalytic converters will potentially cause more problems.