What Codes Will This Page Cover?
This article will cover the following diagnostic codes, their common causes, symptoms, the severity of the issues, and how best to react:
- P1121 Throttle Position (TP) Sensor Circuit Intermittent High Voltage
- P1122 Throttle Position (TP) Sensor Circuit Intermittent Low Voltage
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What Is the P1121 Code?
Symptoms
Causes
Seriousness
Can I Still Drive?
Diagnose
Difficulty of Inspecting
Get Additional Help
P1121 and P1122 error codes signify issues with the throttle position (TP) sensor and, in particular, indicate that the sensor attached to the circuit is reporting intermittent and inconsistent voltage. This intermittent voltage can either be high (P1121) or low (P1122). Either way, this is an issue that will interfere with the performance of the throttle and the car’s ability to accelerate.
Other Meanings for P1121 and P1122 Codes
This particular meaning is attached to these codes only for the following vehicles: Citroen, Peugeot, Ford, GM, and Isuzu. If you have a car from a different manufacturer, then there could be an alternative meaning:
P1121
- Kia, Jaguar: Pedal Position Sensor A Circuit Range
- Lincoln, Mercury: Throttle Position Sensor Inconsistent with Mass Air Flow Sensor
- Volvo, Volkswagen, Audi: 02 Sensor Heater Circ., Bank 2 – Sensor Short to Ground
P1122
- Kia, Jaguar: Pedal Position Sensor A Low Input
- Volkswagen, Audi, Volvo: 02 Sensor Heater Circ., Bank 2 0 Sensor2 Open
Nissan: Electronic Throttle Control Actuator
What Are the Symptoms of a P1121 Code?
If your car begins to have problems with its throttle position sensor, then the first warning sign will likely be the “check engine” light engaging; however, there are more specific signs that you should be aware of. A car with inconsistent voltage in the TP circuit will shudder or jerk when idle, may stall unexpectedly, or experience trouble accelerating. After some time, a vehicle experiencing TP circuit issues may become unsafe to drive due to unpredictable engine performance or even entirely undrivable.
What Are Some Causes of a P1121 Code?
The possible causes of a car flagging the P1121 or P1122 code can be electrical or physical and may be caused by general wear and tear, accidental damage, or a manufacturing fault. The most common causes of these kinds of issues include:
- Faulty sensor
- Faulty sensor harness
- Damaged electrical circuit
- Sensor poorly adjusted
- General wear and tear
- Poor electrical connection
How Serious Is the P1121 Code?
P1121 and P1122 codes are relatively serious for cars. While they are not likely to precede immediate and total engine failure, they do indicate the possibility of increasingly low fuel efficiency and erratic throttle and engine performance.
Can I Still Drive with a P1121 Code?
Technically it is possible to drive a car displaying a P1121 or P1122 code for a short period of time, but the car will become less efficient and more inconsistent as the problem progresses. Over time, your car may fail to start entirely, at which point you may need to call a tow truck to move it to a repair center.
How Easy Is It to Diagnose a P1121 Code?
Diagnosing the underlying causes of P1121 and P1122 codes is straightforward but does require specific diagnostic tools. Testing the connections and delicate components of the electrical circuit is a crucial step in diagnosis. The most common mistake is mistaking a minor misalignment in the circuit for a major fault.
How Difficult Is It to Inspect a P1121 Code?
Inspecting the delicate components that make up the throttle position circuit can be tricky without professional tools and experience. A professional will find it very easy to access and analyze all necessary components, however.
Need Additional Help with Your P1121 Code?
P1121 and P1122 diagnostic codes indicate the presence of a potentially serious issue within a vehicle’s engine and acceleration system. Identifying and rectifying the underlying causes can be complex, which is why quick action is important.
Firstly, if you have concerns about the safety of your vehicle and its drivability, you should use the KBB repair shop locator to find a local repair shop with a tow service. If you are sure you can drive it safely, then you could save money by taking the vehicle to the shop yourself. Expert repairs are the best way to ensure your safety.
Furthermore, you can check the Kelley Blue Book OBD-II Database for additional information regarding the issues and potential secondary problems that vehicles showing these codes can experience. This is a comprehensive resource for those seeking to increase their vehicular knowledge and understanding.
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