Detail: 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.
Solution: 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. , Hi, a 6ya Mechanic can help you resolve that issue over the phone in a minute or two. Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US. click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need. Goodluck!