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How do you know if you need to replace the oxygen sensors or the catalytic converter?
Wiki User
∙ 11y ago
Fault codes thrown by the car's ecm. Neither of these components usually goes bad on its own, their failures are generally caused by something else like a dead cylinder allowing unburned fuel to pass through to the exhaust.
Before you spend the money on either, figure out what other fault codes your car is throwing. If you replace a cat and still have unburned fuel reaching the new one, it will be damaged and you'll need to buy another cat (they wont warranty a failure caused this way)
Wiki User
∙ 11y ago
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In exhaust pipe before catalytic converter unscrew to replace
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Yes, it can affect the oxygen sensors and catalytic converter.Yes, it can affect the oxygen sensors and catalytic converter.
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Where is the oxygen sensor on a 2003 Mazda Protege?
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The upstream sensor screws into the front of the catalytic converter. The downstream is screwed into the pipe after the catalytic converter.
