Trouble code P0302 means:Cylinder 2 misfire detected
Trouble code P0030 means: HO2S heater control circuit (Bank 1 Sensor 1)
Chevrolet began producing the HHR (Heritage High Roof) in 2005. It was a style of station wagon launched by General Motors but has ceased production in 2011.
Most MAF sensors are located in the intake tube or attached to the front of the intake manifold at the end of the air intake tube.
The air filter is in the air box on top of the engine. Disconnect the air intake from the fender, then the wiring to the sensors. The box can now be removed and the filter changed.
Chevrolet HHR was created in 2005.
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The engine power reduced light will turn on in Chevrolet HHR when a failure is detected in one of the sensors or engine components. An OBD II code reader can determine the cause and help with making repairs.