P0301 MAZDA - how long before the code resets

Question

I would like to know how long the p0301 code stays in memory and if/when the computer resets it without external intervention.
At a stop light the engine hesitated and the check engine light came on. After a couple of miles drive and two stops it went off. The following day I read out the p0301 code - it was the only code that showed up. I had a scheduled appointment with the dealer and asked them to look at this.
They told me that everything is OK and that they have not found any codes. I read the code three times before I drove there, and did NOT reset it. Is it possible that it was cleared "by itself" after about a mile drive to the dealer?

Answer 1

Yes, a misfire code can clear itself right away as soon as the misfire stops. Usually within one or 2 trips it will clear on it's own.When the computer sees no more misfire.

Answer 2

P0301

Discription

the misfire detection monitor is designed to monitor engine misfire and identify the specific cylinder in wich the misfire has occurred
misfire is defined as lack of combustion in a cylinder due to absence of spark, poor fuel, poor compression, or any other causes

Possible causes

ignition system
fuel injectors
rinning out of fuel
evaporative emission (EVAP) canister purge valve
fuel pressure
evaporative emission system
exhaust gas recirculation (EGR) system
base engine

diagnostic aids

 

The malfunction indicator lamp (MIL) blinks once per second when a misfire severe enough to

cause catalyst damage is detected. If the MIL is on steady state due to a misfire, this indicates

the threshold for emissions was exceeded and caused the vehicle to fail an inspection and

maintenance tailpipe test.