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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.

Related questions

Smoke; opening hood reveals flames - 2010 BMW 335d
Sounds like either diesel fuel or oil leaked on a hot exhaust manifold or turbocharger. I would press the dealer for a more thorough explanation. "Emission valve" is a rather vague term (Exhaust Gas Recirculation valve maybe?) Still not likely...
The truck is from Georgia which doesn't have smog control. In California it won't pass smog. It has a new motor and transmission.
Hi, the blue-grey smoke you mention is your engine burning oil, probably due to worn piston rings or valve guides and seals. This is expected from an engine with 300K miles on it. Unfortunately for you, California has pretty stringent...
Emissions test
According to the Arizona DMV website, the emissions test will perform the following during an inspection: On-Board Diagnostic (OBD) Test: OBD tests monitor vehicle components and evaluate any system problems. Gas cap test: Makes sure the gas cap can...
check engine light is on -- ge -ot a diagnotics test from onstar -- test stated emmissions system issue whatdoes this mean
Hello, thanks for writing in about your Chevrolet Malibu. If they did not give you the trouble code that is stored then you are going to need to have the system tested to see if the code can be diagnosed...
Emission and Suspension
Hello. To address the converter, there is no cure for a failing converter. In many cases, these cleaners will clean out some of the build up in the converter but definitely not all of it. You will end up needing...
The car has an autocheck report of 90.
Hey there. Failing the emission test is less of a concern than failing a safety inspection. Emission testing failure could be as simple and innocuous as the car having a loose gas cap and setting a DTC. But...
Will I pass my MOT if the dephaser pulley is failing renault megane vvt 1.6
Hello. If your vehicle's dephaser pulley is having issues, it may have a dramatic effect on the engine's emissions levels, which are a part of the MOT test. The MOT test looks at safety, roadworthiness, and exhaust emissions levels. ...
Failed emissions, says that bank system 1 is too lean. The car had sat for almost a year.
Hello there, thank you for asking about your 1999 Nissan Altima. You need to fix any vacuum leak where un-metered air is getting in to the intake manifold. The additional air getting into the engine will cause the lean codes....
Failed emmissions test
Hello. If the plugs and wires have not been replaced for several thousand miles, then replacing them may indeed help lower emissions levels. New plugs and wires can help produce a stronger spark, which will result in a cleaner burning...
Car wouldn't move after repairs were done - 1992 Cadillac Fleetwood
Hi! This sounds like an unfortunate situation with you Cadillac. If it failed the emissions test for running rich (high CO), the ignition systems maintenance that was performed has no impact on reducing CO emissions. Running rich means excess fuel...
Failed a smog test
When the catalytic converter and the O2 sensor are not working properly, the car will fail a smog test every time. I would recommend changing the catalytic converter and the O2 sensor in order to get your car to pass...
Emission light with smoke out the back of car
Hi there. It really depends on the color of the smoke. If it is black then it can be a dirty air filter or a leaking fuel injector. If the smoke is white then it may have a leaking head...
Van will not start randomly
Hello. If you have a new battery and new terminal connectors, then I would be curious about the starter solenoid. That could cause temperamental starting with a perfectly good battery and electrical system. If the starter solenoid is beginning to...
Car won't pass smog.
The path to pass emissions will depend on what part of the emissions test (carbon monoxide (CO), oxides of nitrogen (NOx) or hydrocarbon (HC) levels) were out of tolerance. There are different components, and tuning/repair activities required to address each....
Service Engine Soon Light and P1441 Code, even after replacing purge solenoid
Although some codes require a certain number of drive cycles without problems to reset the Check Engine Light, it sounds like there is still fuel vapor flow from the EVAP system into the engine when there should not be. It's...
Exhaust emission light on
Hi, thanks for writing in. I am wondering what the model, make, and year of your car is, as well as if you have an automatic or manual transmission. This information will make our answers be more accurate. In this...
How do I find out with my 2008 Honda Accord Sedan 4cyl engine is California or Federal regulated for emissions?
All cars have an emissions sticker on the core support, (radiator bracket), or on the under side of the hood. You will need to read the sticker and look for it to say California. If it doesn't, it will be...
Lights coming on and shaking of the car
Hi, thanks for writing in. Without knowing the make and model of your car, it is hard to give guidance on what the issue may be. Luckily since the warning lights have triggered, this means that a diagnostic trouble code...
EVAP Vent valve solenoid code p0449
This suggests you may have a bad EVAP control module. A battery voltage is supplied to the evaporative emission (EVAP) canister vent solenoid valve. The control module grounds the EVAP canister vent solenoid valve control circuit to close the valve...
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...

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