The Smog Stop
6414 University Ave, San Diego, Ca 92115
Mon-Sat: 07:00 - 17:00

Failed Smog Check or Emissions Test

Failed Smog Check
Failed Smog Check Report

If your car failed the smog check in California, you are not alone. Many motorist fail the smog check for a variety of different reasons. The Smog Stop is the authority on Smog Checks in San Diego California. We are your friend when it comes to passing the California Smog Check.. Our goal is to inform every customer of the possible reasons why their vehicle failed smog check, so they can remedy the problem and obtain their DMV vehicle registration in a timely manner. There are hundred of thousands of vehicles on the road that have expired registration because they were unable to pass the smog check. This could result in your vehicle being impounded and hundred of dollars of fees having to be paid in order to get your vehicle released from the impound yard. We have listed the top reasons that a vehicle fails smog check for, so you can be informed and pass the emissions test the first time.

Top Reasons A Vehicle Fails Smog Check

1. Failed For Incomplete OBD Readiness Monitors

The number 1 reason a vehicle fails the smog check is because the OBD parameters are in a “Not Ready” condition. What does the OBD monitors do? The OBD monitors are basically like a built in smog check machine on your car. The cars ECM or computer runs diagnostics test and reports back a pass or fail condition. If the vehicle has not run the diagnostic test, the monitor is incomplete. When the vehicle is undergoing a smog check inspection and the monitors are not complete the vehicle will not pass a smog inspection. This usually results from someone disconnecting a battery or resetting the check engine light right before requesting a smog check inspection. It is imperative that if you had any smog check repairs completed before the smog check, make sure you drive your vehicle at least 100 miles before requesting a smog check inspection. Additionally, if you have changed the battery you need to complete the OBD drive cycle monitors following the same procedure of driving your vehicle 100 miles.

2. Aftermarket Or Modified Parts Installed

People love to customize their cars in California. After all, the automobile is a demonstration of freedom and expression. The problem is when people start trying to modify their emissions devices on the vehicle. It is against the Calfornia Health and Safety Code to modify any emissions device on a motor vehicle registered with the California DMV. There are procedures for manufactures to follow if they want to make a custom part the modifies the emissions system on the vehicle. This procedure involved extensive test with the California Air Resources Board and is very expensive. This results in the price of the part being very high in cost. Consumers always looking for a bargain order a non approved part and fail smog check at high rate. Only order aftermarket California Air Resource Board aftermarket parts. Each one of these parts come with an executive order affixed to the part, so the smog check inspector can verify if it legal or illegal.

3. Malfunction Indicator Lamp Illuminated/Check Engine Light On Failed Smog

If the check engine light is on, you vehicle will automatically fail the smog check. Do not smog your vehicle if the check engine lamp is illuminated. The check engine light is on to let the driver know that the car has detected a problem that needs to be corrected with the emissions system. If the check engine light is blinking it is not a good idea to operate the vehicle in till you have the problem corrected.

4. Failed Smog for EVAP

Your check engine light is going to be illuminated if your vehicle failed the California Smog Check for EVAP. The definition of EVAP is evaporative emissions. Essentially, the fumes from the gasoline in the tank are stored in a charcoal canister and burned by the engine. This system is controlled by the cars ECM and it determines how much of the vapors to burn and when. The problems with the EVAP system are often a failed gas cap or a leak in one of the vapor lines from the tank to the engine.

5. Bank 1 or Bank 2 Lean Failed Smog Check

The check engine light should be illuminated if your vehicle failed smog check for one of these conditions. This is usually a very simple repair. More times than not, it is a vacuum leak. If you are not car savvy we will explain this. A engine creates around 22 inches of vacuum when it is operating properly. If any of this vacuum is escaping it creates a lean condition and the ECM or car computer will throw a code. Bank 1 or bank 2, to lean is the definition of the code. Check you intake boot where it connects to your air filter. Often times this is the source of un-metered air entering the engine throwing off the air to fuel ratio.