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emissions

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How to Replace an Evaporation Vent Solenoid
Emissions are regulated in part by the EVAP vent solenoid which goes bad when your car fails emissions testing or has extra pressure in the gas tank.
How to Replace a Secondary Air Injection Pump
A faulty secondary air injection pump can result in increased emissions, engine performance issues, and an illuminated Check Engine Light.
How to Replace an Evaporative Emission Control Canister
Emissions are regulated by the EVAP emission control canister which fails when the fuel tank gauge does not work or you fail an emissions test.
How to Replace a Canister Purge Solenoid
The canister purge solenoid prevents harmful vapor from releasing into the atmosphere. A faulty solenoid will not allow you to pass an emissions test.

Related questions

Question
car will not pass e-check.
N/A usually means the monitor isn't available on your year make and model vehicle. An emissions monitor should pass or fail or show ready and not ready after the drive cycle has been complete. In most cases, all drive cycles...
Question
Having trouble with trouble code P0455.
Hi. Trouble code P0455 is for the emissions system of the car and the only effect it will have on the car is the fuel economy may go down slightly and the car will pollute the air a little more....
Question
To pass emission test
Hello. I would need to know what engine you have in your Santa Fe to be able to accurately know what is going on. From the information that I have, it seems like you have an oxygen sensor that is...
Question
If my codes for my engine light is P0305, P0430, P0442.
To answer the question will I pass emissions if P0305 is fixed: if the two other codes are cleared after repairs are done for the P0305 code and they do not come back then you may pass emissions. The code...
Question
DMTL and oil filter housing and pan gasket need fixing - what is essential to pass the inspection?
If the check engine light is on, or if there are any trouble codes on the ECU the car will not pass inspection in North Carolina. The DTML Pump is part of the evaporative emission control system. It's job is...
Question
Emissions test failed with a new gas cap
Hey there. This may be related to other possible malfunctions in your EVAP system, such as a faulty vent valve solenoid. The EVAP system prevents fuel vapors from the fuel tank from escaping into the atmosphere. The EVAP system collects...
Question
Emissions light on my Volkswagen
This suggests that you may have a vacuum leak or potentially a problem with your evaporative emissions system. The EVAP system prevents fuel vapors from the fuel tank from escaping into the atmosphere. The EVAP system collects and temporarily stores...
Question
How do I fix the issues related to code P0445 (Failed Emissions Test)?
Diagnostic Trouble Code P0455 has causes in addition to a faulty or loose gas cap. In your circumstance, the first thing you should do is reset the Check Engine Light which will erase the existing codes. Then see if the...
Question
Failed the emission test. I'm suspecting a bad oxygen sensor.
Hi there. Change out the spark plug wires, put sea foam in the vacuum system to clean the internals of the engine and change the oil and filter. Then drive the vehicle around and fuel up with Techron fuel. When...
Question
The car needs a jump after sitting for three days, and now the emission light is on.
Hello. The best step to take when any warning light illuminates is to have the vehicle scanned for diagnostic troubleshooting codes. This will tell you what issue the computer has detected within the emissions system. There may have been a...
Question
My car has an oil leak and a gas smell, could this be an emissions issue?
The oil leak may or may not be relevant. But if you are smelling gas in the exhaust, something is probably making that side too rich. It could be a misfire, but you would have misfire codes for that. It...
Question
Multiple problems with the car I just purchased
Hi there. I am so sorry that this has happened to you. The Check Engine Light bulb needs to be replaced so that you know when the system sees a problem; you didn't know that you would fail the emissions...
Question
Emissions lamp on and won't go out.
Hi there. There could be numerous different things wrong with the emission system to cause the light to stay on. The engine could be running rich or lean causing the O2 sensors to register the condition. The fuel system could...
Question
Why is my car failing CO levels at idle? It passes everything else with ease.
Hi and thanks for contacting YourMechanic. You may have to replace the distributor cap and rotor for a good, strong spark. Then, get some sea foam and put it in the vacuum system of the engine. This will clean the...
Question
What does it mean when there's black smoke coming from the exhaust?
Hi there. Black smoke from the exhaust is an indication of excessive fuel consumption. This may be the result of excessive fuel pressure, caused by a faulty fuel pressure regulator, a very dirty engine air filter, a faulty MAF (mass...
Question
Check Engine Light is on - 2007 Toyota Sienna
This code relates to a heated oxygen sensor which is a unit inside your exhaust system that reads exhaust gases and relays this information to the car's computer. The computer uses this information to make adjustments to fueling. This sensor...
Question
Fuel gauge keeps jumping back past the E on the gas reader
Hey, thanks for writing in. There may be two different issues at play here. Your fuel gauge sending unit may be faulty which is what causes the fuel gauge to fluctuate erratically not reading correctly. This is a small...
Question
Would a major leak from my exhaust back box cause it to fail the emmisions test and LAMDA reading
Hello - while an exhaust leak can have a minor effect on emissions, I would not expect that to cause a "Fail" - UNLESS your state or metro area does tolerate an exhaust leak for safety reasons (carbon monoxide poisoning...
Question
A.I.R. pump is missing in my car
Hello. The A.I.R. system is an emissions system that is designed to inject air into the exhaust manifold to help with the combustion of any unburned fuel before it reaches the catalytic converter, resulting in cleaner emissions. In order to...
Question
How does a smog test work?
How a smog test works depends on where you live. If you live in the United States different states have different requirements and some parts of states may have as well. Usually the more densely populated areas require more stringent...

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