I have an 05 Saturn ION: I shut it off the other day and then went out to start it and it idles very rough. When you put it into gear it has no power at all and hardly moves. I have a five speed. I have three error codes P0300, P0122, P0223. I checked the wiring and it appears to be ok. The throttle position sensor reads 5.02v. Does any one have a solution or Idea?

SOURCE: I need to find the fuel filter on a 2004 saturn

Check your plugs, check the ign module, test the injectors,take a fuel sample and make sure there isnt water in your fuel, if all these test good perform a compression test. if the compression test fails replace the head. if the compression test is good. check the timing

SOURCE: my check engine light on my 07 saturn ion keeps

1174 is a lean code, and would have to been set first because it will not set when the 0300 is there. 0300 is a random misfire, because it read after the lean code, it was probably caused by the lean condition. 1st check for vacuum leaks from hoses or intake gaskets, you cal listen for a hissing sound, or spray carb cleaner around intake systems, a change in rpm will be noticed when spraying near a vac leak. other probable causes are the upstream 02 sensor, map sensor, or fuel delivery problems. does the vehicle idle porly, or does it miss at the top end?

SOURCE: 05 saturn ion dtc po420 and p0 411

go to this link for fault code P0420
http://www.obd-codes.com/p0420
all this read the catalytic converter is most likely worn out.
This Definition of P0411 is : Secondary Air Injection System Incorrect Flow Detected
What does this mean? u have a electric air pump that pumps fresh air into the exhaust system during cold start, this reduces exhaust emissions, that pump is defective, replace it.

SOURCE: 96 olds ciera trouble codes p0122 p0300 missingthrough entire ran

A code P0122 may mean that one or more of the following has happened:

• TPS not mounted securely
• TPS circuit short to ground or another wire
• Faulty TPS
• Damaged computer (PCM)

Possible Solutions Some recommended troubleshooting and repair steps are:

• Carefully check the throttle position sensor (TPS), wiring connector, and wiring for breaks, etc. Repair or replace as necessary
• Check the voltage at the TPS (refer to a service manual for your vehicle for specific information). If the voltage is too low that is indicative of a problem. Replace if necessary.
• If recently replaced the TPS may need to be adjusted. On some vehicles the installation instructions call for the TPS to be properly aligned or adjusted, consult a repair manual for specifics.
• If there are no symptoms at all, the problem may be intermittent and clearing the code may resolve the issue temporarily. If this is the case then you should definitely check the wiring to be sure it's not rubbing on anything, grounding, etc. The code may come back.

A code P0300 may mean that one or more of the following has happened:

• Faulty spark plugs or wires
• Faulty coil (pack)
• Faulty oxygen sensor(s)
• Faulty fuel injector(s)
• Burned exhaust valve
• Faulty catalytic converter(s)
• Stuck/blocked EGR valve / passages
• Faulty camshaft position sensor
• Defective computer

Possible Solutions If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.
Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak
in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.

SOURCE: where can i find the Throttle Position Sensor on

Follow the black hose from the air cleaner to the intake manifold. On one side of the transition, you will see where the accelerator cable attaches to a mechanism to open the throttle plate. On the opposite end of the shaft connected to the throttle plate is the throttle position sensor. There are a couple of wires coming out of it.