Hi so my wife has a 2017 Mazda Cx-5 and out of nowhere the check engine light came on and started to flash on the car, began to run very rough. It entered lymph mode. I was able to get it home only about a mile away. I changed the spark plugs. It did not fix the misfire. I was able to hard reset the car, shutting off the check engine light. I got it to AutoZone and it threw a code for a misfire in the second cylinder and a large Evap leak. In the parking lot, I changed the coils from cylinder two to cylinder one to see if the coil was the issue And it wasn’t. I was wondering if someone can point me in the right direction the code is it threw were P0455,P2097, and P302. I was told it could be a purge solenoid or a bad injector. I don’t have the money to replace both so I was hoping somebody could help me out. I appreciate your help thank you.

 

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This is per Google's AI search summary. Hope it helps:

The diagnostic trouble codes (DTCs) P0455, P2097, and P0302 indicate a combination of an evaporative emissions leak, a rich fuel condition, and a misfire in cylinder 2 on your 2017 Mazda CX-5. These codes are likely related, with a potential common cause being a faulty evaporative purge solenoid.

Understanding the Codes

• P0455 (EVAP System Large Leak Detected): The car's computer has detected a significant leak in the evaporative emission control system, which is responsible for capturing fuel vapors. The most common and simple cause is often a loose, damaged, or missing gas cap.
• P2097 (Post Catalyst Fuel Trim System Too Rich Bank 1): The downstream oxygen (O2) sensor is detecting too much fuel in the exhaust, indicating the engine is running rich.
• P0302 (Cylinder 2 Misfire Detected): The powertrain control module (PCM) has registered a misfire specifically in cylinder number 2.

Potential Common Cause & Troubleshooting
The most likely component linking all three issues is a faulty EVAP purge solenoid. If the purge solenoid fails "open," it constantly pulls fuel vapors into the engine's intake manifold, which can:

• Cause the P0455 large leak code.
• Create an overly rich fuel mixture, leading to the P2097 code.
• Over-fuel a specific cylinder (potentially cylinder 2), causing the P0302 misfire.

Recommended Steps

1. Check/Replace Gas Cap: The cheapest and easiest first step for a P0455 code is to inspect the gas cap gasket for damage and ensure it is tightened correctly until it clicks. If it's old or worn, replace it with a new, genuine Mazda cap. Clear the codes afterward and see if they return.
2. Inspect EVAP Purge Solenoid: If the gas cap isn't the issue, have the EVAP purge solenoid checked. A mechanic can test its operation or "smoke test" the EVAP system to pinpoint the leak.
3. Address the Misfire: If the purge valve is not the source of all three problems, the P0302 misfire needs independent diagnosis. This could be due to a bad spark plug, ignition coil, or fuel injector in cylinder 2. Moving the coil to another cylinder and seeing if the misfire code follows is a common diagnostic technique.
4. Professional Diagnosis: Due to the combination of complex codes, it is highly recommended to take your vehicle to a qualified mechanic or a Mazda dealership for proper diagnosis to avoid replacing unnecessary parts. They can use specialized diagnostic tools to check live data and pinpoint the exact source of the problem.