O2 sensors for a 03 Toyota Corolla ce

5

Asked by Jdog87 Nov 22, 2019 at 05:42 AM about the 2003 Toyota Corolla CE

Question type: Maintenance & Repair

I just want to know if it's normal for my 03 Toyota
Corolla ce to only have one 02 sensor an it's before
the cat now I thought you needed one before an
after the cat.

1 Answer
41,330

TDolby answered 5 years ago

Your car should have an upstream and downstream. Like you said one before the cat and one after in the exhaust system, not necessary close to the cat.

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