2013 Mazda3 question
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Junior Member
Joined: Oct 2017
Posts: 8
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From: San Francisco
P0303
POSSIBLE CAUSE
• Erratic signal to PCM
― APP sensor signal malfunction
― ECT sensor signal malfunction
― IAT sensor signal malfunction
― MAF sensor signal malfunction
― CKP sensor signal malfunction
― TP sensor signal malfunction
― VSS signal malfunction
• Ignition system malfunction
― Spark plug malfunction
― Ignition coil related wiring harness malfunction
― Ignition coil malfunction
• Excessive air suction in intake air system (between dynamic chamber and cylinder head)
• Erratic signal to fuel injector
• Base engine malfunction
― Leakage engine coolant to combustion chamber
― Insufficient engine compression
• Fuel injector malfunction
• PCM malfunction
POSSIBLE CAUSE
• Erratic signal to PCM
― APP sensor signal malfunction
― ECT sensor signal malfunction
― IAT sensor signal malfunction
― MAF sensor signal malfunction
― CKP sensor signal malfunction
― TP sensor signal malfunction
― VSS signal malfunction
• Ignition system malfunction
― Spark plug malfunction
― Ignition coil related wiring harness malfunction
― Ignition coil malfunction
• Excessive air suction in intake air system (between dynamic chamber and cylinder head)
• Erratic signal to fuel injector
• Base engine malfunction
― Leakage engine coolant to combustion chamber
― Insufficient engine compression
• Fuel injector malfunction
• PCM malfunction
- Thanks!
Thread Starter
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Junior Member
Joined: Oct 2017
Posts: 8
Likes: 0
From: San Francisco
Hi ,
diagnose made by Mazda dealer for Misfire on cylinder 3 was fuel injector malfunction. Changed the fuel injector on this one but soon check engine light came back giving a misfire code on number 4 cylinder! Injector on cylinder 4 malfunction? This car is giving me a hard time! Anyone experiencing same problem with injectors?
diagnose made by Mazda dealer for Misfire on cylinder 3 was fuel injector malfunction. Changed the fuel injector on this one but soon check engine light came back giving a misfire code on number 4 cylinder! Injector on cylinder 4 malfunction? This car is giving me a hard time! Anyone experiencing same problem with injectors?
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MazdaCustomerExperience
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Feb 14, 2014 09:41 AM
