changed upsteam o2'sno different do i need to do downstreams?

Asked by Jun 28, 2013 at 02:06 PM about the 2000 Ford Windstar LX

Question type: Maintenance & Repair

5 Answers

27,505

No. Unless something is wrong with them.

1 of 1 people found this helpful.

why did you change o2 sensors?

check engine light and codes po 171 ,174 with brand new engine about 3000 miles ago

27,505

You most likely have a vacuum leak causing the lean codes.

1 of 1 people found this helpful.
24,545

Yeah, lean codes on both banks is very likely a vacuum leak.

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