Question about Hyundai Motor 2002 Elantra

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My car is a 2002 Hyundai Elantra that has failed obd emissions in NH. My mechanc and the cars dealership has tried everything to correct this. I have spent approx $700.00 for a $40.00 sticker and they cannot find the problem. This has been going on since May

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  • Hyundai Master
  • 4,340 Answers

BUT, if you failed, something is wrong. Seriously shorter engine life will result if you continue to drive the vehicle.
Find and repair the cause of the failure readings.I cannot understand why dealership could not find the issue(s).

Posted on Jul 28, 2010

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Posted on Jan 02, 2017

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2002 Hyundai Elantra that says my on board computer is not ready to be tested. Emission results are: readiness- fail, monitor comprehensive- not ready, monitor EVAP not ready,monitor O2 not ready.


Did you recently clear the trouble codes or disconnect the battery? Once all codes are cleared, the computer will not display systems 'ready' until they go through an evaluation cycle. Some of the systems require a certain number of drive cycles before they will display 'ready'. A drive cycle is usually starting the engine from a cold start (based on coolant temperature) and driving until certain conditions are met. I don't know what the requirements are for your car, but my 2003 pickup truck requires more than 10 drive cycles before it will make the O2 sensors and evaporative emissions 'ready'. Most states only require that a certain number of systems are showing 'ready' to pass emissions certification.

Oct 22, 2016 | Hyundai Motor 2002 Elantra

2 Answers

I have two codes come up when checking why my check engine light is on. P0447 and P0420. Any info on what these mean and what it takes to fix so I can pass my smog test??


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Definition of P0420 is catalyst below threshold. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). Catalytic converters are not normally a "wear" type item, that is they are not deisgned to wear out and need replacement. If they have failed, it is likely due to something else that caused it to fail.

P0447 Evaporative Emission Control System Vent Valve/Solenoid Circuit Open. The Powertrain Control Module (PCM) has detected an open within the circuit that controls the vent valve or solenoid for evaporative emission systems vapor.

Read more at: http://www.obd-codes.com/p0447
Copyright OBD-Codes.com

http://www.trouble-codes.com/

http://www.obd-codes.com/trouble_codes

Jan 26, 2016 | Hyundai Motor 2002 Elantra

3 Answers

PO-139 I had that sensor change 3 weeks ago and the check engine light came on again this morning.Thanks


Probably replaced a good sensor. This codes could be from a bad sensor, a vacuum leak, or an exhaust leak before the sensor.

Dec 01, 2015 | 2006 Hyundai Tucson

1 Answer

My 2001 Hyundai Elantra is dying alot the engine light codes are p0720, p0105, p0445


code P105 is manifold absolute pressure barometric pressure circuit. code P0445 evaporative emission system purge control valve circuit shorted. code PO720 AT output speed sensor circuit open or short ground.HAVE MANY CODES COULD BE ECM FAILING HAVE DEALERSHIP CHECK OUT ECM.ECM COULD HAVE SHORT OUT PC BOARD.

Mar 12, 2013 | 2001 Hyundai Elantra

2 Answers

Obd computer won't reset


you can force the engine light to come on with ready or not software (type it in on google) i have this gear. your ecu has to reconise all emmissions sensors data on a 3times in a row before it will complete a full diagnostics cycle.
the ready or not scanner and software will atomatically do everything for you and tell you when everything is ready (so much easier than messing about guessing all the time).
you can also program scanner to your state regulations aswell.think it's about $50 now

hope this helps.

regards, danny

Oct 01, 2012 | 2003 Dodge Caravan

1 Answer

Hyundai Tiburon P0447


You can try disconnecting the battery for a minute then driving about 15-20 miles on the highway while trying to stay at about 55. This will often rebalance the sensors in the emissions system. Note: you must drive the minimum distance required by your ECU, or you'll fail inspection automatically due to lack of adequate feedback from your your OBD.

May 28, 2012 | 2001 Hyundai Tiburon

1 Answer

97 acura TL 2.5 NH state inspection station computer can't connect to vehicle OBD for emission testing. scantool will read ECU but will not connect to OBD part. Went to four different stations with...


Had the same problem two years ago, and now have it again. Apparently, there is a special tool used to pressurize the emissions so that you can get a reading. Had to go to an Acura dealership about 40 miles from my home to get this done.

Sep 21, 2009 | 1997 Acura CL

1 Answer

Emmision test failed?


maybe i can help, the car has to be in a obd rhope this helpseadiness mode,thecar is probably not in this mode because it has not been driven enough or the(right way). you have do do a drive cycle to get the computer to go into obd readiness mode. also check pin #16 on obd connector tomake sure it has power. go to obd website for complete instructions on the DRIVE CYCLE it is rather long,

Apr 08, 2009 | 2000 Hyundai Elantra

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