Chrysler Repair: chrysley stalls down, throttle position sensor, oxygen sensor

Question
hi Ronald

        i did mail you several times in the past about my chrysler 95 2.5 V6 dies like it is loosing the pickup.i checked all the vaccum lines and they seem to be perfect.finally the error code comes oout it says 12-21-21-21-24 . but this stalling dosent happen all the time if i warm it enough it drives fine. sometimes it just looses all the pickup. the ideling when on park still goes up and down up to 3000. some times it tends to break down like stop mov-stop move-stop move-stop move. like 5 to 5 to six times and  then goes fine .

   i think it i the oxygen sensor but which one will be that  and what is 24. added to all this some days it runs just fine do you think it is necessary to get these done it already has lots of milage.or can i rrun the car as it is will this effect other parts of the car if i run it the way it is .

 what is this limp in mode i have no idea can you let me know hpw it feeels to be in lim in mode

  is it possible i can do this repair myself

sorry if i am bothering you too much

thanks in advance
Raj

Answer
Hi Raj,
The trouble codes are probably pointing you toward your engine performance problems. The 21 code is for the oxygen sensor which is located on the main center pipe of the front exhaust manifold. (There is also a "rear" sensor, after the catalytic converted, but it is less likely to be at fault, so I would start by replacing the front sensor.) You can replace that one pretty easily but you have to put some penetrating oil on the threads overnight to loosen it up, and the new one will come with some grease to apply to threads before installing it. Be careful with the wire connectors so as not to damage them. Torque the sensor to about the same extent as you would a spark plug.
The 24 is for the throttle position sensor not changing its
voltage when the throttle valve is opened and closed. This might also be due to a problem with the wires that are attached to the sensor which is located at the intake manifold entrance as part of the throttle body. It is on the side of the throttle body that faces the driver and has three wires: gray/yellow, blue/green, and brown/red. Those wires' insulation might have gotten brittle because of heat from the rear exhaust manifold being nearby so I would visually inspect those for compromised insulation. You can also check the patency of the wires between the sensor and the plug-in at the engine controller which requires an ohm-meter or continuity checker. So let me know if you want the details of how to do that, otherwise just buy a new sensor and install it. You can also do voltage tests on the wires if you want to verify that it isn't the sensor itself.
I think you will be pleasantly surprised with the improvement in the engine if you deal with these two problems.
Roland