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

25,955

No. Unless something is wrong with them.

1 out of 1 people think this is helpful.

why did you change o2 sensors?

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

25,955

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

1 out of 1 people think this is helpful.
22,465

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

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