Skip the auto shop - Our mechanics make house calls

Q: How do you make sure readiness codes are set in the computer for emissions testing?

asked by on

How do you make sure readiness codes are set in the computer for emissions testing?

If you live in an area where emissions testing is mandatory, you’re no doubt familiar with the hassle of not being able to test your car if the readiness codes aren’t set. Thankfully, there’s a way you can help make sure that the re-test is successful. Follow these steps:

  1. Fill your gas tank only about three-quarters of the way.

  2. Park the car and leave the engine off for a minimum of 6 hours.

  3. Make sure the outside air temperature is at least 40 degrees F and no higher than 95 degrees F.

  4. Start the engine (don’t touch the gas).

  5. Let it idle for 20 seconds (keep that foot off the gas).

  6. Lightly touch the gas pedal and increase the engine RPMs to 2,000. Hold that for about 3 minutes, or until the temperature gauge rises about a fourth of the way up.

  7. Let off on the gas and let the car idle for another 20 seconds (again, no using the accelerator).

  8. Find a road with little traffic and drive at 60 MPH. Maintain that speed for about 20 minutes. Don’t engage the cruise control system, either. When possible, keep the accelerator pedal in the same position for about a minute and a half.

  9. Find an area where traffic is “normal” and drive for about 10 minutes. Try to let the car coast for 5 seconds or so without touching the brake or the gas.

  10. Park the car for at least a half hour before having your test performed.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  • Home
  • Questions
  • How do you make sure readiness codes are set in the computer for emissions testing?

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: What does the malfunction indicator Warning Light mean?

The malfunction indicator Warning Light is on your instrument cluster. It illuminates when the On-Board Diagnostics-Second Generation (OBD II) system detects an issue. The OBD II system monitors your vehicle’s emissions. When the malfunction indicator Warning Light is illuminated, it...

Q: How do I view the range feature?

The range feature displays approximately how many miles you can drive before your fuel tank is empty. To view this feature, press the Trip Computer switch until the range is displayed. Tips The range feature is an approximation, and is...

Q: What’s the proper way to refuel?

While refueling your car isn’t particularly complicated, there are a few specific steps you’ll want to follow with the Honda Accord. Don’t worry – it’s easy: Pull up with the driver’s side facing the pump. Open the...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.