If there is anything that you would like to add, please leave a comment below. Good luck diagnosing P0121 in your Fiat Punto. It no longer is accurately tracking how hard the fuel pedal is being pushed.ĭiagnosing the issue with a scanner or having a mechanic take a look can save the expense of buying a TPS sensor that your Punto does not actually need.
Most of the time, the problem when P0121 is thrown will be the TPS sensor itself. The blower/fan in my Fiat punto Dualogic stopped working a couple of days ago and I have been trying to locate the fuse for it ever since, the trouble is I do not have the handbook for my car so I have no fuse diagram,the user manuals I have downloaded from Fiat and sourced on the web do not refer to the fuse box in my car (please see attached.
If it all checks out and the code comes back, they may go ahead and replace the TPS sensor in question. After that they’ll typically inspect the TPS wiring to make sure that it is not loose or damaged. The mechanic will also compare the data from TPS circuit “A” and “B” to see where the discrepancy is. They’ll then see if the problem comes back. This is what you need to address.Ī good mechanic will utilize a scanner to diagnose when the codes were set and reset them. The computer thinks that the culprit is the “A” circuit. In normal English, the two TPS circuits can’t agree on how far the gas pedal has been pushed down.
There’s a YouTube video below that shows how to go about diagnosis with a scanner. Diagnosing it can be tricky without a good scanner and the knowledge of what you are doing. OBDII code P0121 is a serious problem that requires serious attention. It is relatively serious problem since it can leave your vehicle in failsafe mode. It’s an OBDII code and has to do with the Throttle Pedal Position Sensor. P0121 is a relatively common trouble code with the Fiat Punto.