Make: Pontiac Model: Sunfire Year: 2001 Engine: 2.2 L Trans: Automatic
Hello to every one, bought my first car and it is fine except for this little annoying problem. After driving it for a while the
trac off light goes on and the RPMs start to go really high 3K ~ 4K, the transmission does not upshift gears and when it does it kicks a bit hard and I've noticed that if I let go the accelerator the car sometimes shuts down, this problem comes and goes, it goes away if I stop using the car for a while but eventually comes back, I had the car scanned at autozone and at a transmission repair shop they obtained the following codes:
P0122 - Throttle Position Sensor P0420 - Catalyst System Efficiency Below Threshold P0742 - Torque Converter Clutch
I have a few questions regarding the codes:
- How serious are these codes?
- How reliable is the diagnosis of the scan?
- Which of these are DIY'able?
- What's the recomended order to fix them?
Thank you for all your time.