Catalitic converter

[Solara08861]

My check engine light came on yesterday took it to the dealer today once again I need the cat replaced again. Second time in less than a year.

[Jon11582]

Just so your aware, if either your front or rear O2 / A/F sensors are bad, it may throw a code that suggests the cat is bad.

The cat performance is measured by the difference reading (measured in volts) between the precat O2 or A/F sensor and the O2 sensor after the cat. If either one isnt reading the voltage right, it may throw throw a bad cat code.

Its usually the O2 sensor after the cat thats gone bad in such a situation, as a voltage problem on the O2 sensor before the cat usually throws a different code.

[Solara08861]

The waranty still covers it. Let them keep putting new cat.