I took my 03 Toyota Tacoma to PepBoys to investigate and repair the source of the check engine light being on. The truck seemed to run fine and the light had been on for 3 weeks with no noticeable problems. After 4 hrs PepBoys called and said that the oxygen sensor was defective and two other sensors needed to be replaced. They also indicated that my spark plugs were 'fouled out' and needed to be replaced along with the plug wires. They also recommeded their fuel system service. Total price $1230.00! Wondering why it would... read full review »