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2016 Mazda CX-9 Signature 2.5L Hesitation
Symptoms: Weak acceleration, reduced power. After disconnecting the Catalytic converter the exhaust still seems restricted. Could it be an exhaust manifold problem?
FIX posted 8/28/2025
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Message Closed w/FIX
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Related Documents & Media | VIN | JM3TCBEY8G |
| Engine | 2.5 L / 4 cyl / GAS |
| Trans | 6-speed Automatic (Electronic) |
| Delivery | Fuel Injection |
| Emissions | OBD-II Compliant |
| Symptoms | Hesitation |
| Occurs | Always |
Trouble Codes
| P421: | P042100E8 Catalyst 1 Efficiency Below Threshold Bank 1 |
Message Closed w/FIX
Vehicle Data
2016 Mazda CX-9 Signature
| VIN | JM3TCBEY8G |
| Engine | 2.5 L / 4 cyl / GAS |
| Trans | 6-speed Automatic (Electronic) |
| Delivery | Fuel Injection |
| Emissions | OBD-II Compliant |
| Symptoms | Hesitation |
| Occurs | Always |
Trouble Codes
| P421: | P042100E8 Catalyst 1 Efficiency Below Threshold Bank 1 |
Video