Mazda3 Offered in both a sedan and wagon, this sporty model offers a great car for the family, as well a fun track car.

Engine light

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Old 05-24-2018, 05:17 AM
Africa1's Avatar
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Default Engine light

Hi guys, was driving to work tis morning and my check engine light came on, i plugged the scanner in and it came up with a fault code saying that the vehicle was over fuelling, but when i did an emissions test the air fuel ratio at the exhaust came out at 14.7 : 1 which is bang on what its meant to be, i ran a couple tests and got the readings below
 
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Old 05-24-2018, 06:46 AM
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What was the actual fault code?
 
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Old 05-24-2018, 08:50 AM
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Already cleared the code, will run the car abit and if it pops up again will post the code, the blurb that came with the code literally just said its over fuelling
 
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Old 05-31-2018, 12:37 PM
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Default Fault code

hi guys the fault code came up again, its reading “P0172”
 
  #5  
Old 06-01-2018, 04:06 AM
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POSSIBLE CAUSE

Misfire
• Erratic signal to PCM
― APP sensor signal malfunction
― ECT sensor signal malfunction
― MAF sensor signal malfunction
― TP sensor signal malfunction
― VSS signal malfunction
• A/F sensor heater malfunction
• A/F sensor malfunction
― Looseness A/F sensor
― A/F sensor deterioration
• MAF sensor malfunction
• Fuel supply system malfunction or improper fuel line pressure
― Pressure regulator malfunction
― Fuel pump unit malfunction
― Fuel leakage on fuel line from fuel delivery pipe and fuel pump
― Fuel filter clogged or restricted
― Fuel return hose clogged
• Improper connection of purge control system
• Improper operation of EGR valve system
• Improper operation of variable tumble solenoid valve
• Improper operation of PCV valve
• PCM malfunction
 
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