If there is anything that you would like to add, please leave a comment below.Hello, I need to make an analogue of the program punto switcher 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. 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. A discrepancy between the voltage reading from TPS sensor circuit “A” and TPS circuit “B” where TPS circuit “A” is lower than the specified voltage range by more than 0.8 volts.A discrepancy between the voltage reading from TPS sensor circuit “A” and TPS circuit “B” where TPS circuit “A” is higher than the specified voltage range by more than 1.6 volts.In the Fiat Punto, the P0121 is going to be caused by: The vehicle’s ECM will control the amount of fuel entering the engine in order to control engine speed.įailsafe mode leaves a vehicle in a state that makes it almost impossible to drive and enjoy.Since the ECM won’t really know how much throttle response is actually happening when you push the gas. This limited power is a failsafe to keep the vehicle able to move, but not super fast. The vehicle will hardly respond to the throttle at all.Here are the most common symptoms of P0121: The symptoms of P0121 are going to vary by year and model, but they certainly are going to cause noticeable changes in the way that your Punto drives. It’s a general powertrain code, which means that it has the same meaning regardless of who manufactured the vehicles (1996+, Punto or not).
P0121 will trigger in your Fiat Punto if it’s TPS “A” circuit has an output voltage that goes above or below the sensor’s normal operating range. 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.
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