Question about Saturn Ion
How do I clear the code P0121 after the problem has been fixed?
I should start by saying a trouble code does not mean a component must be replaced. It only means the signal from the sensor is out of range or the affected circuit needs to be checked out.
Code 121 means the signal from the TPS is either out of range or not where the computer thinks it should be. Such as the TPS tells the computer the throttle is closed when it is actually open.
You would need to use a scanner to see the data coming from the sensor to tell if it is working or not. The problem could be the throttle or the wiring back to the computer.
Posted on Feb 11, 2014
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Posted on Jan 02, 2017
The best way is to use a scan tool to clear the codes, that will turn off the light, also disconnecting the battery over night may work, but no completely sure about that, it varies from year to year.
Posted on Sep 23, 2008
did you check voltage to sensors if you need help with proedure, contact me, or you may try patrs houses on line in how to section.
Posted on Oct 06, 2008
you have to know what the code is that your truck putting out your truck has 4 O2 sensors. the trucks computer is smart and the code will tell you witch one is bad but if you replace just one the next one on the same exhaust pipe will probley go bad so its safe to replace all four. the draw back to replaceing all of them is thay cost about 80 bucks for one ACDelco O2 sensor. It has to be done before it will pass Emissions. not a hard part to change about a 7/8 open end wrench will take it off. have fun.
Posted on Jul 19, 2009
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