Check engine light
10

Asked by GuruXNBTX Nov 02, 2018 at 07:49 PM about the 2002 Mercury Mountaineer AWD

Question type: Maintenance & Repair

I need help. My check engine light is on. We
replaced the egr valve, spark plugs, coils,
pcv valve. Code p1131 coming up. Lack of
ho2s11

1 Answer
20

Jean answered 6 years ago

That will be your o2 sensor down stream

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