Auto Repair Articles

Question:

I have a 1998 Toyota Camry V-6 (1MZ-FE) engine, with automatic transmission, not a California car, that has a check engine light. I took it to the local Advance Auto store and their tester indicated that the O2 sensor heater circuit malfunction (bank 1 sensor 1) had failed. The sensor was replaced and the system was reset by removing the negative battery cable for 5 minutes and then reconnected. After driving a few miles the check engine light came on again. There seems to be a difference of opinion if there are one or two O2 sensors prior to the catalytic converter. What is your suggestion?? 
 

Answer:

There are (2) O2 sensors prior to the catalytic converter. Each sensor is located in the exhaust manifold assembly. One in the front (radiator side) and one in the rear (firewall side). Bank 1 Sensor 1 is the back sensor (firewall side).

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