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Just had MAf clean, how many miles I have drive to reset codes to emission test.

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The service shop that you took your vehicle to should have cleared the codes to see if they came back after repair and a test drive.If they did this and the light came right back on then the repair wasnt successful and you still are having a computer related problem.

Posted on Feb 05, 2010


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My 2001 x5 evap & catalyst report not ready, I reset my MAF OBDII Code ~70 miles before checking it, but...

if you had reset the code[ or had a dead battery]you just cleared and reset all the vehicles evap / emissions systems it now has to recycle through to reset you wont have a check engine or mil unless computer finds a fault and on most vehicles it can be about 125 miles and usually the last to reset are the evap and the catalytic converter drive around and at around 125 mark go to an auto store and have vehicle scanned most offer this service for free or if you have one check your system for ready if not keep driving some more most states give you 10 days to retry so use that time to rack up miles -- and dont reset or clear codes before an inspection

Jul 19, 2016 | 2001 BMW X5 4.4

1 Answer

How d I reset not ready monitors

No such thing as resetting an Emission Monitor

What your asking-- is how to clear the dash light--
& ALL Data, you need to diagnose the problems
with monitors that don't run clear, with no problems

First you need to look at the OBD Codes you have
Diagnose those codes & component test & find a problem
& correct it & continue on

Without a Professional Scan Tool your at a disadvantage

If you have cylinder misfires that ruined the converter,then
you have to clean that up & test the oxygen sensors or at
least look at the data

I start with Battery Voltage,Module Voltage,Fuel Trim,MAF Data
& then Mode $06 Misfire Data & Cat Temp & on & on

All but the Evap Monitor should run in about 10 to 20 miles
of driving,not 345

You also have Freeze Frame Data at the time the Monitors
Ran & failed

So NEVER Clear the check light/MIL Lamp, etc
unless ALL issues are fixed & then only if you have to

Fault Codes you need only appear after a monitor runs,
pass or fail,so forget the battery disconnect or code clearing,
you need that data

Oct 15, 2014 | 2008 Saturn Sky

1 Answer

How many miles do i need to drive before my buick lesabre reset itself

Unfortunately it is not a certain amount of time or miles that the car needs to be driven.

There are several 'readiness monitors' that basically cover each emissions related system. For instance there is an EVAP monitor that checks the EVAP system and all of it's components under certain specific conditions (No VSS, TPS, O2 sensor, IAT, MAP, Fuel trim, Injector ciruit, EGR pintle position, ECT, or MAF sensor DTC codes set; Start up engine temp 40F-86F; gas tank between 15% and 85% full, Barometer above 75 kPa, system voltage 8V-16V).

So more information is needed as to what failed you the first time. What DTC code was triggered?

If the problem has been fixed right, the history codes will go away after 40 CONSECUTIVE drive cycles WITHOUT the problem re-occurring.

Good Luck.

Jun 25, 2014 | 2000 Buick LeSabre

2 Answers

Codes PO440 and PO101


P0101 = Mass Air Flow (MAF) Sensor Performance
P0440 = Evaporative Emission (EVAP) System

I have had this problem before with trying to get my cars inspected. The easiest way I can suggest, is to bring it to Autozone or Advanced Auto Parts, and have them clear all your codes. Then put about 100 miles on the car of daily driving and bring it back to the same place to get it inspected. They should reinspect for no charge if you already paid for it.

I have noticed my check engine light going on when using the cheapest gas. Maybe try running a tank of the best stuff in there. At most, at least you will be cleaning your engine, and you will notice performance and gas mileage increases as well.

I hope this helps!


Dec 29, 2011 | 1999 Oldsmobile Silhouette

1 Answer

I replaced the MAF sensor on my 2004 camry 4cyl two weeks ago and cannot get the EVAP or Catalyst code to reset. I've had multiple techs drive to reset these and have had no luck! Do you think I...

what do you mean by reset?? are you talking about drive cycles not completing?? you tring to pass emissions? some veh will take up to 500 miles!! to go through all drive cyles ..or are you actually talking about a evap code I.E. p0440 and a cat codeI.E p0420??? if thats what your talking about those will need a repair to get those cleared

Jul 28, 2011 | Toyota Camry Cars & Trucks

2 Answers

I have 6 cyl 03 ford ranger, check engine light came on and had it read and code says po422 EVAP, any help would be appreciated

The catalytic converter is no longer functioning properly
An oxygen sensor is not reading (functioning) properly
There is an exhaust leak

Sometimes simply resetting the code is all you need to do. Many codes will reset themselves over time. What the person meant was that in normal driving the code may reset itself. You don't need to waste your time or fuel driving nowhere to attempt to reset the code.

Personally, here is what I would do if I were you. If the place in Texas where you are moving to does not require emissions testing, do nothing for now. If the car seems to be running normally the code may reset itself. If Texas requires emissions testing you will need to have the problem addressed or the car will not pass emissions. Bring the car to a reputable independent mechanic for repairs. If it is your catylitic converter expect some sticker shock as these can be expensive. Hope this helps, Please rate this!!! :) James Booth

May 23, 2011 | 2003 Ford Ranger Regular Cab

2 Answers

My 2002 Grand Prix GT 3.8L Won't pass emissions. Testing center's scanner says car was recently worked on and that the mileage driven since is not enough to recycle check engine light. The ck eng. light...

Nope, you just need more miles. When the car's computer has been disconnected from power (such as when the battery is unhooked), it'll set what are called "readiness codes" when power is reapplied. It takes a certain number of miles to clear these - some cars require 50 miles, some 100 miles, and some (such as some Isuzu models) need very specific drive cycles to clear them. Once the requisite number of miles have been driven without issues, the readiness codes will extinguish and your car should pass.

Dec 10, 2009 | 2002 Pontiac Grand Prix

1 Answer

Failed TN emissions testing. 1996 Mazda

the computer needs to be reset by performing a code erase then drive 500 miles

Sep 23, 2009 | 1996 Mazda Protege

3 Answers

Check engine light fault code PO505

This code is for your electronic throttle control system it probably needs to be cleaned the butter fly sticks due to build up in side the throttle body clean with tooth brush and emission save throttle body cleaner clear codes and then dissconnect the battery for 3 hours hook back up then go for a short drive stop and go to reset idle control that should take care of this.

Jun 11, 2009 | 2001 Toyota Sequoia

1 Answer

Trouble codes- What to do with them?

P0102 - Mass Air Flow (MAF) Sensor Circuit Low Frequency, clean inside the of MAF sensor with spray brake clean, if code returns replace the Mass Airflow sensor (MAF)
P0440 - Evaporative Emission (EVAP) System,
poss loose or leaking gas cap
P0128 - Coolant Thermostat Below Thermostat Regulating Temperature,
replace the thermostat, engine running cold
P0716 - Input Speed Sensor Circuit Intermittent, this is a problem with the VSS, vehicle speed sensor, replace it.
Clear all the codes after above repairs and drive a few days, then retest system for codes.

Sep 23, 2008 | 2002 Buick LeSabre

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