July 5, 2020

So' Cal's Most Trusted Tire Shop!

Orozco’s Tires 101 blog, back this time with something slightly different. Something that may not noticeably effect your vehicle’s performance, but which can legally keep your car off the road: the California smog check.

The CA Smog Check program requires vehicles manufactured in 1976 or after to undergo a smog check every two years. It is designed to reduce air pollution by forcing owners to repair cars which produce excessive emissions. Furthermore, anybody wishing to sell a vehicle over four years old must first have a smog check performed.

What are some of the most common causes for a failed emissions test? Here are seven of the most common reasons that might cause you to fail a smog test:

1. Fuel metering specification – there are several factors that can alter the specification of your vehicle’s fuel metering. These could be due to faulty computerized engine control, carburetor, fuel injection unit, or other intake components.

2. Faulty oxygen sensor: the O2 sensor in a vehicle measures the oxygen in the vehicle’s exhaust emissions. A malfunctioning oxygen sensor is a somewhat common issue that can be caused by several things and lead to several other problems such as overheating, higher emissions, and loss of power.

3. Defective ignition system; this means that during a hydrocarbon check the analyzer detects a high amount of hydrocarbons. If the vehicle is not properly maintained, this is a common problem to develop. The most common causes of abnormally high hydrocarbon levels are defective spark plug wires, worn out spark plugs, over advanced ignition timing, or worn out distributor caps.

4. Leaks in the vehicle vacuum. Vacuum leaks are a common reason for failed emission tests, and they are often caused by a malfunctioning MAP sensor which measures the load of an internal combustion engine’s electronic control system. Leaks often develop in the gaskets or vacuum lines of the fuel system.

5. Rich fuel mixtures: high CO2 level is often caused by either a weak ignition or a rich fuel mixture, which could be caused by a dirty oxygen sensor, leaky fuel injectors, excessive fuel pressure, or others.

6. Malfunction in air injection system: the air injection system helps reduce hydrocarbon and carbon monoxide emissions by forcing fresh air into the engine’s exhaust. If the air injection system malfunctions, the engine will not be able to control these emissions and they will become higher than usual.

7. Faulty EVAP system. The EVAP, Evaporative Emission Control System, prevents gas vapors from the fuel system from being released into the atmosphere. The most common faults in EVAP systems are vacuum hoses or vents, defective purge valves, or a malfunctioning gas cap.

Here at Orozco’s Tires & Wheels in Long Beach, we can diagnose and remedy all of these problems, and more, and help you pass your smog check and keep your car on the streets. If you are having emissions problems or need your state-mandated smog check, call Orozco’s Tires & Wheels today at (844)-676-9267! Our team of state-certified mechanics can fix any of your emission problems and get your car legal, guaranteed!


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Orozco's Auto Service
3619 Atlantic Ave., Long Beach, CA 90807

Orozco's Auto Service
3033 Long Beach Blvd., Long Beach, CA 90807

Orozco's Auto Service
9681 Alondra Blvd., Bellflower, CA 90706

Orozco's Transmission
9665 Alondra Blvd., Bellflower, CA 90706

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