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Http://www.obd-codes.com/p0420 this is an oxygen sensor reading that's saying that your left bank catalytic converter is not working at optimum range.. emissions problem. the other says :Knock sensor #2 circuit low input (bank 2). take the car into a muffler shop and have it looked at and tell them about the codes and ask them which sensor is the #2 knock you'll probably have to get the converter changed out anyway.
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You need a better scanner to diagnose, not just for codes. It sounds like faulty shift solenoids. A professional grade scan tool computer is bi-directional and can command solenoids to operate and verify that they did.
There are several potential issues that could be causing your 2005 Chevy Monte Carlo to spit and sputter while driving. Here are a few possibilities:
Fuel delivery issues: If your engine is not receiving the correct amount of fuel or air, it can cause hesitation or rough idling. This could be due to a clogged fuel filter, a malfunctioning fuel pump, or a problem with the air intake system.
Ignition system issues: A faulty spark plug, ignition coil, or other component of the ignition system can cause misfires, which can make the engine hesitate or sputter.
Emissions system issues: Your vehicle's emissions system is designed to reduce harmful pollutants in the exhaust. A malfunctioning component of this system, such as the oxygen sensor, can cause the engine to run poorly.
Electrical issues: A damaged or worn electrical component, such as a sensor or relay, can cause the engine to run rough or stall.
Transmission issues: If your vehicle is experiencing transmission problems, such as slipping or shifting issues, it can cause the engine to hesitate or sputter.
To determine the exact cause of the problem, it's best to have your vehicle diagnosed by a certified mechanic. They can perform a diagnostic scan to check for any error codes or issues with the engine, transmission, or emissions system.
Very common Transmission code - solution # 1 check to be sure Fluid is full . If not trans code sent plus will turn on check engine light or service engine soon . # 2 be sure condition of fluid is Good / Not worn out . Fluid must be Red / Reddish in color Cold and When hot- warm still have red / even lighter than when cold .# 3 if a higher than 50,000 mile car used in heavy rush hour traffic during hot weather then change fluid to give it fresh oil / Trans will fight heat better and save you a $$ 2000 repair bill . # 4 most important of all you can save a Trans by adding Lucas Trans treatment it is $ 20 some places but well worth $$ to extend life of vehicle if one in need of saving $$ .This can even be added to existing fluid if color is still reddish .
is your check engine light on ? if not check the fuel filter it may be plugged. it is also possible that your fuel pressure is low, is it start it then it bogs and dies, for you may have a defective idle air mixture solenoid, this will not call up a code there for no check engine light, hope this helps , let me know good luck
Most major auto parts stores scan codes or will let you use a scanner in their parking lot free of charge. Stop by a parts store, scan the code number and post it back here for additional help.
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