How To Pass Your Nissan Altima's Emissions Test

Most states require your car to pass an emissions test before you can renew your registration. The goal of emissions tests or smog checks is to ensure vehicles with faulty emissions systems do not continue producing excessive pollutants. A brake pad replacement is a common upgrade when preparing for this test. From checking your gas cap to shopping for the best Nissan Altima catalytic converters, you want to be sure you have taken all the steps you need.

Figure Out if Your Car Has a Problem

Start by checking for common issues that can cause a car to fail emissions. Your first port of call is the check engine light: if it is on, the most common reason is a problem with a part that regulates emissions. These include:

• Catalytic converter

• Oxygen sensor

• AirFuel ratio sensor

• EVAP system

• Exhaust gas recirculation system

A problem with any of these can mean excessive emissions. If you have a code reader, you will be able to figure out why the check engine light is on. Take your car to a mechanic before the test; otherwise, you risk failing.

Steps To Take

Seemingly minor issues that do not cause the check engine light to go on can also present problems. One common reason cars fail emissions is the excessive buildup of dirty oil and gas residue. Driving at highway speeds can help the catalytic converter get enough heat to burn them out; lower speeds will not get rid of residue. Start doing this about two weeks before your test. In addition, changing the oil shortly before the smog check is also helpful.

Another area where pollutant deposits can build-up is the intake and exhaust system, which can accumulate carbon deposits. Using a fuel additive when filling up the gas tank can help get rid of these deposits.

One of the items that will be tested during the smog check is the gas cap. It must not be damaged and must provide a tight enough fit to ensure fuel does not escape. Cracks or a bad fit can lead to failing the test.

Filters and hoses are some other parts that can let escape harmful emissions if they are not in good repair. These parts are also vulnerable to wear and tear and therefore need frequent checking. You also want the minimum amount of any type of buildup or residue in your vehicle at this time, so have all filters changed or cleaned. Have your mechanic check for leaky hoses or damaged filters before the test.

When a car's engine works too hard, it uses more fuel and generates more emissions. In many states, smog checks also test the efficiency of the engine. Check for reasons your car may not be running as efficiently as possible. One common reason is that the tires are under-inflated.

In general, the time before your Nissan Altima is due for an emissions test is a good time for a general tune-up. Head to a reputable online seller to find pads for Nissan Altima brakes, replacement filters, gaskets and more.