Did your car fail an emissions test in Fort Collins?
You take your car in for an emissions test expecting it to be another item to check off the list. Instead, you leave with a failed test and a new problem to figure out.
So, what now?
First, a failed emissions test does not automatically tell you exactly what needs to be repaired. It tells you that something caused the vehicle not to meet the requirements of the inspection. The next step is figuring out why.
Why Did My Car Fail Emissions?
There isn't one universal reason a vehicle fails an emissions test.
According to Air Care Colorado, common reasons can include the vehicle exceeding allowable emissions limits, the onboard diagnostic system detecting a problem, certain dashboard warning lights being illuminated, malfunctioning emissions equipment or a gas cap, and visible smoke.
That means the test result is a starting point, not necessarily a diagnosis.
What Does the Check Engine Light Have to Do With Emissions?
On vehicles equipped with onboard diagnostics, the computer continuously monitors systems that can affect how the engine and emissions equipment are operating.
When the computer detects certain problems, it can store a diagnostic trouble code and turn on the check engine light.
The code is useful information, but it does not always mean the component mentioned in the code needs to be replaced. A technician still needs to determine what is actually causing the problem.
That distinction matters when you're trying to get an emissions problem repaired instead of simply replacing parts and hoping the light stays off.
A Real Example From Our Shop
We recently had a 2005 Toyota Camry come into King’s Auto Center after it failed an emissions test.
The vehicle also had a lean code stored in the computer.
Rather than immediately replacing a part, Matt started by looking for possible problems with the intake and vacuum system. An air leak can affect how an engine runs, so checking for an obvious leak was part of narrowing down the cause.
When those initial checks didn't reveal the problem, he continued looking at live data from the vehicle. That led him toward the mass airflow sensor.
The mass airflow sensor measures the air entering the engine so the vehicle's computer can determine how much fuel is needed. When Matt removed the sensor, there was significant contamination visible on it compared with the new sensor.
A new sensor was installed, but the job didn't end there.
The next step was going back into the scan data to see what changed and verify the diagnosis.
Why Diagnosis Matters After a Failed Emissions Test
It's tempting to search the trouble code online, buy the part that comes up most often, clear the light, and head back for another test.
The problem is that a trouble code is a clue.
Different problems can sometimes produce similar symptoms or codes. That's why a proper diagnostic process may include checking the vehicle for leaks, inspecting components, reading stored trouble codes, and looking at live data from the vehicle.
The goal is to identify the cause of the problem before deciding what actually needs to be repaired.
What Should You Do After Failing an Emissions Test?
Start by keeping the paperwork you received from the emissions testing facility. The information from the failed inspection can help when the vehicle is diagnosed.
Then have the cause of the failure properly diagnosed.
Once the necessary repair is completed, the vehicle can be taken back through the appropriate emissions testing process.
And if your check engine light is already on before your scheduled emissions inspection, don't assume it'll be fine. Depending on the vehicle and the type of inspection, an illuminated warning light or an emissions related problem detected by the onboard diagnostic system can result in a failed inspection.
Do I Need an Emissions Test in Fort Collins?
Emissions testing requirements apply within designated areas of Larimer County. Requirements can vary based on factors including the vehicle's age and fuel type.
For gasoline and gasoline hybrid vehicles, Larimer County currently lists an exemption for the first seven model years.
Because requirements can change and individual situations vary, it's a good idea to check your registration renewal notice or the current Larimer County and Air Care Colorado information before heading to a testing station.
Failed Emissions in Fort Collins? We Can Help Figure Out Why
If your vehicle failed an emissions test, the important question isn't just how to make the warning light disappear.
It's why the vehicle failed in the first place.
At King’s Auto Center in Fort Collins, we can diagnose check engine lights and vehicle problems that may be contributing to an emissions failure. Just like with the Camry in our shop, the goal is to work through the problem, identify the cause, and determine what actually needs to be repaired.
If your car failed emissions or your check engine light is on, contact King’s Auto Center to schedule an appointment.
