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Burning smell and p071 code

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azxtreme:
So I'm getting a really nasty burning smell from the Xterra and a p071 code, it says it's running lean and it could be exhaust system, mass air flow, O2 sensor.

Thupertrooper (Victor):
Maf clogged air filter
Bad cats clogged cats
If misfire or running bad ign coils.

baronjon:
Have you tried checking if there's an exhaust leak?

pinchel (Rob):
I'd start with the east stuff. Like a clean air filter. Put in a tank of premium if you can, that will help if its a cat issue.

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