HI there
The codes could actually be there because you are smelling raw fuel. If the engine is running to rich it will affect the O2 sensors. These codes are both for the front O2 sensor. If the engine is running rough it could be causing the codes,
P0135 CHEVROLET - HO2S Heater Performance Bank 1 Sensor 1 Read more: https://www.autocodes.com/p0135_chevrolet.html
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