Question about 2001 Hyundai Elantra

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Having the same problem the other guy described.

I've changed the O2 sensor a number of times and just had the Speed Sensor replaced as well.

I took the car to Hyundai and they pulled these codes:

P1529 TCM Request for Malfunction Lamp on Signal
P0422 Main Catalyst System Efficiency Bank
P0456 Evaporative Emission System Leak (very small leak)
P0455 Evaporative Emission System Leak (Large Leak)
P0720 Output Speed Sensor (Pulse Generator B)
P0715 Input? Turbine Speed Sensor "A" Circuit

Can anyone make sense of all this? I need to get the car inspected in NY and can't pass if the check engine light remains on.

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  • 1,280 Answers

First of all, these codes are what are called "Powertrain Trouble Codes' (that's what the "P" means P=Powertrain). TCM Request (Transmission Control Module = TCM). The request was to turn on the 'Check Engine" light.
P0720 - output speed sensor circuit malfunction
P0715 - Input speed sensor (turbin speed) circuit malfunction
P0442 - Evaporative Emission System Leak (Small Leak)
P0455 - Evaporative Emission System Leak (Large Leak)
Check fuel filler cap problems - for Evap Emiss leaks
Replace the pulse generators & have the trans fluid replaced/flushed.
The Main Catalyst System Efficiency Bank 1 Is P0420, not P0442
If you had P0420 code, the catalytic converter is shot... and that's an expensive component.

Posted on Oct 18, 2009

  • lweesi Jan 10, 2011

    thanks for all , I just bought this car and I have the same codes that he told us about but in the same time I fount out that there is no oil in the engine so I called the seller and he said he havent check the oil for 6 mounth , do you think its burning oil ? becouse I dont see any leek , or becouse he havent check the oil for 6 mounth as how he said since he was driving on high RPM without forth speed ( transmition need output sensor ) ?

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