2007 Pontiac G5 Multiple OBD2 Codes (P0030, P0036, P0053, P0054, P0102, P0443) - How to Diagnose and Fix?
I'm experiencing multiple OBD2 diagnostic trouble codes on my 2007 Pontiac G5: - P0030: HO2S Heater Control Circuit (Bank 1 Sensor 1) - P0036: HO2S Heater Control Circuit (Bank 1 Sensor 2) - P0053: HO2- S Heater Resistance (Bank 1, Sensor 1) - P0054: HO2S Heater Resistance (Bank 1, Sensor 2) - P0102: Mass or Volume Air Flow Circuit Low Input - P0443: Evaporative Emission Control System Purge Control Valve Circuit The check engine light fuse blows every few days. I've already replaced it twice. I took the vehicle to a repair shop, but they are uncertain about the root cause. One technician suggested replacing the fuse box — this seems unlikely given the nature of these codes. I'm looking for guidance on where to start troubleshooting effectively. Vehicle details: - Stock configuration with no aftermarket modifications (especially electrical) - No history of accidents or exposure to deep water or extreme conditions What should be my first step in diagnosing and resolving this issue? Is it a wiring problem, sensor failure, or an electrical circuit fault? Any recommendations for basic diagnostics using a digital multimeter and factory wiring diagrams would be greatly appreciated.
Have there been any recent events such as deep water exposure, accidents, or major repairs? The vehicle is stock with no aftermarket electrical modifications. If none of the above apply, the issue likely stems from basic electrical troubleshooting — using a digital multimeter and referencing the factory wiring diagram. Note: The check engine light circuit often shares a common path with the cigarette lighter circuit. Check if any devices are plugged in or if debris is trapped inside the lighter socket.