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Diagnostic code P1406 on 2002 Mazda Tribute

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My son's car has been running rough and the engine light is on. Acceleration is very sluggish. The diagnostic report is:
P1406 - problem with differential pressure feedback sensor downstream hose is disconnected or blocked, have checked and no obvious thing found.
Any ideas before we spend a heap of money fixing every other than the problem?
Regards
Sum
(3) Answers
review when last tuned. it may be due.
rec. fuel system clean. ethanol treatment to 1 tank premium fuel.
rec. diff. service. get oil in diff. changed.
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