P0171 P0400 P1131 P1130 MAF sensor Mazda 626 √ Fix it Angel

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1996 1997 1998 1999 2000 2001 2002 Mazda 626, 2.0L, 4 cylinder.

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1997 Mazda 626. Cleaning the Mass Air Flow sensor.
DTC codes:
P0171 - Indicates the fuel/air ratio is too lean. The fuel adaptive system is at the rich correction limit.
P1130 - Indicates the fuel control system has reached it's maximum compensation for lean or rich condition and the HO2S is not switching.
P1131 - Indicates the fuel/air ratio is correcting rich for an overly lean condition. the HO2S voltage is less than 0.45 volts.
P0400 - Indicates an EGR valve/flow failure

Possible cause:
Fuel system
-excessive fuel pressure
-leaking fuel injectors
-low fuel pressure
-contaminated injectors

Base engine
-oil overfill
-cam timing
-cylinder compression
-exhaust leaks before or near the HO2S's

Induction System
-air leaks after the MAF sensor
-vacuum leaks
-restricted air inlet
-PCV system
-fuel purge system
-improperly seated dipstick

EGR System
-leaking gasket
-stuck open EGR valve
-leaking diaphragm

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