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All these codes showed up and and now its backfiring through the intake
Vehicle: 2005 Mazda 3 2.0L

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P2195 02 sensor signal stuck lean Bank 1 Sensor 1

P2187 Fuel system too lean at idle

P2177 Fuel trim too lean at off idle

P0455 Evaporative emission control system leak detected

To resolve this code a KOER (key on engine running ) test would have to be performed, as well as a KOEO (Key On Engine Off) test would have to be performed

Backfiring thru the intake , this would surely damage the air filter . if not would cause a fire. , Your vehicle has a vacuum leak, some of the common would be a stuck open purge valve,

​ Here on this Mazda 3, same codes, backfire thru the intake and you can see burned marks done to the airfilter

​ The code that did show up that where present was a P0440 (evaporative emission control system malfunction and a P2187. Doing a KOER test the code came up different , P0171 (fuel trim lean Bank 1) and P0441 (incorrect purge flow) , disconnecting the purge hose and sealing it off, and retesting the vehicle proved that the purge was stuck open , This caused the EVAP code, as well as the lean code. The fix replace the purge valve, and replace the airfilter.

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