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Will Clearing Codes Pass Emissions?

Sophia Al-Mansoor • • 7 min read
Will Clearing Codes Pass Emissions?
To pass an OBD-II emissions test, a vehicle must:
If you clear the 'Check Engine' light, or reset the OBD-II monitors right before your emissions test, your vehicle typically will not pass because the catalyst and EVAP monitors need time to run. If it's not in a "ready" state, your vehicle will automatically fail.

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Moreover, can you pass emissions with stored codes?

Short answer: the old codes are stored for a time, but they shouldn't affect your emissions test if they're not active. Long answer: IIRC, there are several things the emissions test checks for: 1) That the MIL (Malfunction Indicator Lamp, or check engine light) works.

Likewise, what codes will fail emissions test? Failed Emission Test Codes: Most Common Trouble Codes

Description Percentage Trouble Code
Evaporative Emission (EVAP) System 5.5% P0440
Evaporative Emission (EVAP) System Small Leak Detected 6.7% P0442
EVAP Vent Solenoid Valve Control System 3.1% P0446
EVAP (Evaporative Emission) System Leak Detected (large) 6.2% P0455

Also Know, how far do you have to drive to reset the check engine light?

100 miles

Can you tell if codes have been cleared?

There really i no way of knowing if codes have been cleared. If you get lucky and have a good scanner, (Modis, Autel, etc.) you may be able to locate history codes. If you are looking to purchase a vehicle, ask the seller to allow you to road test the vehicle.

Related Question Answers

How do you tell if OBD codes have been cleared?

If the MIL (yellow engine icon) turns off abruptly after 20 seconds, then you know the DTCs have been reset by the engine monitoring system and not by a scan tool or by disconnecting the battery.

How do I permanently remove OBD codes?

To clear the Permanent DTC using a dedicated monitor cycle, start by repairing the fault that caused the DTC in the first place. Then clear all the codes except for the permanent DTC (if it were that easy, there'd be no problems), and make sure the Permanent DTC is the only one left.
Sophia Al-Mansoor
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Sophia Al-Mansoor

Sophia analyzes international trade, startup ecosystems, retail transformation, and supply chain logistics for modern digital publications.