A properly installed K&N product should not cause the Service Light to illuminate. The service light is a warning from the car’s computer that something appears abnormal with the car. It does not always mean something is, in fact, wrong with the car and some conditions can cause a false warning. A Service Light can be triggered because the engine is sensing denser air than it expects based on ambient conditions and expected restriction.

No. An engine can only draw in a certain volume of air depending on the engine’s size (measured by such things as bore, stroke and number of cylinders). Vehicles are designed to accommodate large changes in air pressure so they can operate at sea level or at an altitude of 14,000 feet. Engine computers adjust the amount of fuel required as a result of changes in air pressure (density).

It is impossible because we know that the oil treatment on our cotton is very small (usually less than 2 ounces). Once the oil is properly and evenly absorbed through the cotton, no oil will come off, even under extreme engine conditions.

Almost all K&N air filters come pre-oiled and ready to use. They are packaged in a clear cellophane wrapper with the words “Factory Pre-oiled – Ready To Install”. The filter oil we use is red. A new oiled filter will appear red-pink in color. Some crankcase vent air filters come unoiled, however, they come with a small packet of K&N filter oil so they can be oiled before use. There are also a limited number of filters with specialty uses which are not pre-oiled.

If you have not experienced a decrease in mileage or engine performance, chances are your filter is fine and does not yet need cleaning. To be more specific, the filter does not require cleaning if you can still see the wire screen on the entire air filter regardless of how dirty it may appear. When the screen is no longer visible some place on the filter, it is time to clean it.

K&N has an active Custom Air Filter Program to meet the needs of consumers with special filtration needs. We offer thousands of possible configurations of custom filters, in different shapes, dimensions and heights. Click here to read more.

Use a K&N Filter Care Service Kit, available at all major auto parts stores and a low pressure nozzle-free garden hose. A filter cleaned with K&N cleaning products will ensure a lifetime of performance from your air filter. Instructions for cleaning your K&N air filter are on our Air Filter Cleaning Instructions page.

For best results, we recommend that you use K&N air filter recharging oil and K&N air filter cleaner. K&N air filter oil is a special compound which forms a very efficient tacking agent that helps capture dust. Our cleaner is a non-detergent degreaser. Petroleum products such as transmission fluid and motor oil will soften and destroy the rubber sealing edges. Harsh solvents and gasoline will harden the rubber seals causing the filter to distort (shrink).

A Both the 'check engine' and 'service engine soon' lights mean the same thing. When either of these lights come on, it means that your engine computer has detected a problem with a sensor or with something a sensor has detected. Your vehicle probably will need a computer scan to determine the problem and how important the problem is. If the vehicle still runs good when one of these lights comes on, chances are it is not an emergency problem.

K&N direct replacement filters which install into your vehicle’s factory air box can provide an increase of between 1 and 4 horsepower. Results will vary depending on your vehicle, driving habits, load on the engine (towing for example), existing air system restriction, and other factors.

K&N makes several different types and configurations of performance air intake systems. Depending on the year, make, and model of your vehicle, only one style of intake system may be available for that vehicle. All of our intake systems are dyno-tested and guaranteed to increase your vehicle’s horsepower. Instead of making a general claim, we publish actual intake system horsepower increases for many part numbers and vehicles.

Most K&N air intake systems are warranted for 1,000,000 miles which exceeds the warranty offered on the original factory intake system. The installation of an air intake system should not void your factory warranty. It is never a bad idea to contact your local dealership and ask them before purchasing the new K&N system whether they will object.

Air filters are not measured by micron size. As an industry standard, air filters are tested in accordance with the ISO 5011 test protocol to measure capacity (the physical amount of dust a filter can hold before cleaning is necessary) and efficiency (the filter’s ability to trap and hold dust). See technical service bulletin 89-5R from the Filter Manufacturer's Council. The dust selected for the test contains a specified distribution of different particle sizes according to ISO standards.

If an existing K&N filter is large enough to provide negligible restriction, a larger than required filter will not affect the amount of air an engine can take in, however, it will lengthen the filter’s service interval. A longer service interval can be an important factor when racing in dusty, dirty environments.

You most likely have 1996 or later car. In 1996, GM instituted the OBD-II standard on the F-Body computers. This makes modifying the car much more difficult than in the past. Simple changes (such as disabling CAGS) will cause the computer to sense a problem and light up the service engine light. Luckily, you can fool the computer into thinking CAGS is still connected. The resistance of the CAGS solenoid is 15 ohms. Assuming 13.5 V, that means about 12 W are dissipated.

It's probably a blown air pump fuse (20 amp). Take the cover off the fuse box under the hood and locate the fuse. If it's blown, simply replace it. If it keeps blowing, then you probably have a faulty air pump which should be replaced as per the Technical Service Bulletin (#636502).

A:You can buy the K&N chemicals (cleaner and reoiler) or you can use a detergent called Formula 409 (used for cleaning kitchens in the US) to save some money (the K&N cleaner is rumored to be the same as Formula 409). You should always use their oil though. Also do not rinse the filter in hot water. It'll shrink the cloth.

It means your vehicle's onboard computer system has self-diagnosed some kind of problem. The "Check Engine" light, which is also called a "Malfunction Indicator Lamp" (MIL) or "Service Engine Soon" (SES) lamp, is there to signal you when a problem occurs that may require attention. This can include anything from a momentary hiccup that has has little or no noticeable affect on engine performance or driving safety to a failure of a major electronic component.

Autozone, offers free code reading (the dealer will charge 60 bucks or more to read the codes. The most common reason the CEL will come on is due to the gas cap is not tight enough or something else emission related CODE P 440 You can buy a cheap code reader for 30-50 bucks (often on sale) at Harbor Freight link to code reader . If you take it to the dealer or another mechanic your going to pay 50-80 bucks for them to read your codes.

If prior to the EnergyCel installation no trouble codes were found and the check engine light intermittently appears in most cases there is nothing to worry about. If prior to the EnergyCel installation trouble codes were found but ignored and wiped out by the ECU reset then the original problem has been found again by the ECU. Repair action is required.

A check engine comes on when your vehicles on board computer system senses a problem. There are many things that could cause the light to be activated. It could be as simple as a loose gas cap or as complicated as one of the many sensors malfunctioning.

Check that the gas cap is screwed on until it 'clicks', if not, tighten it, and the light may go out on it's own. The vehicle has sensed that gas fumes are escaping from the vehicle through that gas cap. If it is not the gas cap, call our Service Department to set up an appointment, and we will remedy the problem. Click a link below to go to our service departments.

There is a relationship between air filter restriction and mileage. The theory behind this is simple, the harder an engine has to work to suck air through the intake tubes and air filter, the more gas gets wasted in the process. Replacing a dirty or clogged air filter is one of many recommendations the U.S. Department of Transportation suggests for improving fuel economy (see http://www.fueleconomy.gov/feg/FEG2007.pdf).

It is against federal law in the United States for a manufacturer to require the use of a specific brand of air or oil filter unless it provides a replacement air or oil filter, free of charge, under the terms of the vehicle warranty. For a more thorough discussion of this law known as the Magnuson-Moss Warranty Act, see our Vehicle Warranty Section of our Air Filter Facts page, and our Letter Regarding Vehicle Warranty and K&N Replacement Filters.

There are a few things that would cause a MAF to fail, but the most common occurance is a manufacturing defect in the MAF itself. The MAF sensors found in Audi A4, Passat B5/5.5, Golf IV, Jetta IV and Beetle models have had an unusually high number of failures, regardless of whether the stock air intake or an aftermarket intake was used. Internal sources within Volkswagen have told us that some of the original equipment MAF units have been plagued with manufacturing defects.

Yes, we can make just about anything, but the cost can be prohibitive on panel filter types. Generally, we only change the height of existing round filters. This includes cylindrical, conical and oval filters clamp-on or not. For more information see our custom air filter news story.

A K&N filter has up to a 30% better air flow rate and have million mile warranty. The filter generally compliments the performance of the Tunit and helps your fuel economy.

Several owners have reported the check engine light keeps turning on and dealers could not find anything wrong. There seems to be two problems having the same syndrome. One is overfilling gas tank. The other is a faulty oil quality checking sensor. Insist your dealer to fix the problem if you're not overfilling the gas tank.