Honda Pilot: Emissions Testing
Testing of Readiness Codes
Your 2023 Honda Pilot has readiness codes as part of its onboard self-diagnostic system. These codes are used by some states to verify whether your vehicle's emissions components are functioning properly.
Important Note: The readiness codes may not be read correctly if the test is performed right after the battery has died or been disconnected.
How to Check Readiness Codes:
- Set the power mode to ON without starting the engine.
- Observe the malfunction indicator lamp (MIL):
- If the MIL comes on for several seconds and then goes off, the readiness codes are set.
- If the MIL blinks five times, the readiness codes are not set.
Ensuring the readiness codes are set can help avoid issues during emissions testing.
If you are required to have your vehicle tested before the readiness codes are ready, prepare the vehicle for retesting by doing the following:
1. Fill the gas tank to approximately 3/4 full.
2. Park the vehicle and leave the engine off for 6 hours or more.
3. Make sure the ambient temperature is between 40ºF and 95ºF (4ºC and 35ºC).
4. Start the engine without touching the accelerator pedal, and let it idle for 20 seconds.
5. Keep the vehicle in (P). Increase the engine speed to 2,000 rpm, and hold it there for about 3 minutes.
6. Let the engine idle with your foot off the accelerator for 20 seconds.
7. Select a nearby, lightly traveled major highway where you can maintain a speed of 50 to 60 mph (80 to 97 km/h) for at least 20 minutes. Drive on the highway in (D). Do not use cruise control. When traffic allows, drive for 90 seconds without moving the accelerator pedal. (Vehicle speed may vary slightly; this is okay.) If you cannot do this for a continuous 90 seconds because of traffic conditions, drive for at least 30 seconds, then repeat it two more times (for a total of 90 seconds).
8. Drive in city or suburban traffic for at least 10 minutes. When traffic conditions allow, let the vehicle coast for several seconds without using the accelerator pedal or the brake pedal.
9. Park the vehicle and leave the engine off for 30 minutes.
The readiness codes are erased when the battery is disconnected, and set again only after several days of driving under a variety of conditions.
If a testing facility determines that the readiness codes are not set, you may be requested to return at a later date to complete the test.
If the testing facility determines the readiness codes are still not set, see a dealer.