which oxygen sensors upstream or downstream

Asked by Mar 05, 2015 at 09:43 AM about the 2000 Ford Windstar SE

Question type: Maintenance & Repair

2000 ford windstar rough idle and stalling

3 Answers

11,740

upstream= before cat, downstream= after cat.

1 of 1 people found this helpful.
251,505

O2 might not be the problem, only detecting the problem. Do you have a misfire and vacuum leak? Scan for codes.

50,835

Bad O2 sensor will not stop car from starting or idling. As Tom said, scan for codes.

1 of 1 people found this helpful.

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