Maybe your car hasn’t been running very well and you are worried your vehicle may not pass the smog inspection. Wondering what can cause a car to fail the emissions test? If you are a conscientious car owner, you certainly want your vehicle to be running its best! Nearly every vehicle must pass the smog inspection to be legally registered.
So what can cause a car to fail the emissions test? Here are the 4 most common problems that may cause your car to fail the test:
- Bad Oxygen Sensor. If this oxygen sensor fails, it cannot monitor the exhaust properly, leading to additional issues such as overheating, loss of engine power, and more toxic emissions.
- Rich Fuel Mixture. If your vehicle is burning excessive amounts of gasoline, it may be found that there are high levels of carbon monoxide. This can happen because of a faulty MAF sensor or oxygen sensor, or because of leaking fuel injectors.
- Bad Fuel Metering. If the computerized engine control or fuel injection unit fails, the air-fuel mixture could be off, causing the engine to run poorly.
- Faulty EVAP System. The Evaporative Emission Control System, also known as EVAP, prevents the release of gasoline vapors into the air. If there is a leak in the connected vacuum hoses or vents, or if the gas cap is loose or cracked, the EVAP system cannot work correctly.
Fortunately, most of these problems are not too costly to repair. Be sure to have any or all of these issues repaired as soon as you are aware of them, not only because you want to pass the smog inspection, but because you want your vehicle to run at maximum efficiency.
Do you have questions about what can cause a car to fail the emissions test? Consult our ASE Certified Technicians at Auto Max of Oregon for more information about smog inspections and to make an appointment. Our auto repair shop proudly serves vehicle owners in Canby, OR and surrounding areas.
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