2000 Toyota Corolla Exhaust Manifold

2000 TOYOTA COROLLA
160,000 MILES • 4 CYL • FWD • AUTOMATIC
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ROXANA D
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  • 1 POST
I had a catalytic convertor replaced two years ago and since my engine light came back on. I got a code 171 and secondary 420. They replaced both front and back oxigen sensor and another oxigen meter by the engine and the light is still one with the same two codes coming up. The dealear said that I need an exhaust manifold and a new convertor while the place that warrantied the converter said that can only be a leak at the manifold that can give a 420 code. Whom I should believe and how can I make the difference between having a leak at the manifold or a manifold broken? Would you please let me know if the manifold can signal a false 420 code?

Thank you
Jul 8, 2008 at 11:54 AM
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KHLOW2008
  • ✓ASE Certified Mechanic
  • 41,814 POSTS
  • ASE Certified Mechanic
Hi Roxana D,

It is possible for a leaking exhaust to cause the codes. If the exhaust is leaking, it would produce a louder than usual noise so get it repaired first.

The code problem might go away once the exhaust is repaired.
Jul 8, 2008 at 2:06 PM
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