Freyja Burch
If you suspect that one of your TPMS sensors is failing, there are several ways to identify which one is at fault. The TPMS (or Tire Pressure Monitoring System) is a pre-installed system in modern cars that monitors the pressure of your vehicle's tires. It does this by using sensors installed in each tire, which constantly measure the air pressure and send this information to your car's computer. If the TPMS detects an issue, it will alert the driver. However, if the sensors get damaged, they may send incorrect data, so it's important to know how to identify a faulty sensor.
| Characteristics | Values |
|---|---|
| Illuminating TPMS warning light | A warning light on the dashboard indicates a problem with the TPMS sensor. |
| Tires have low air pressure | A faulty TPMS sensor may not alert the driver when tires are underinflated. |
| Jerky steering wheel | A faulty TPMS sensor can cause the steering wheel to become difficult to control, jerking left and right even when trying to keep it straight. |
| Increased fuel consumption | A flat tire due to a faulty TPMS sensor can increase fuel consumption as the engine burns more fuel to compensate. |
| Alerts or warnings are incorrect | A faulty TPMS sensor can send incorrect information to the car's computer, leading to incorrect alerts or warnings. |
| Low or dead sensor batteries | Sensor batteries have a service life of around 5-7 years and can cause the TPMS sensor to become faulty if drained. |
| Corrosion and foreign matter | Corrosion or dirt buildup on the valve stem of a TPMS sensor can cause it to fail and, if not addressed, can lead to tire damage. |
| Recent tire change | A TPMS sensor can be damaged during a tire change, causing it to malfunction. |
| Poor engine performance | A faulty throttle position sensor will not respond to pedal input, resulting in inadequate power output. |
| Engine surges and stalls | A failing TPS can cause the engine to search for an idle, leading to surges and stalls. |
| Engine starts and dies immediately | A faulty TPS can cause the engine to start briefly and then die, and pressing the accelerator pedal may not help. |
What You'll Learn
Trial and error: air filling and releasing
If you suspect that one of your TPMS sensors is failing, you can identify which one is faulty by doing a lot of trial and error, such as air filling and releasing. This process requires time and patience.
First, check all four tires and fill each one with the recommended air pressure. Then, gently release air from each tire one by one, and check the car display panel. If a tire doesn't send a message to the car display panel, it means that it has a defective sensor and needs to be checked or replaced. Make sure you mark the wheel with the defective sensor and fill the other tires with the recommended air pressure.
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Digital pressure gauge
A digital pressure gauge is a useful tool for identifying a faulty TPMS sensor. The TPMS (Tire Pressure Monitoring System) has a sensor installed in each tyre that alerts the driver if their vehicle has an underinflated or overinflated tyre.
To use a digital pressure gauge to identify a faulty sensor, you should first check the pressure of each tyre and note down the readings. Next, compare these readings to the ones indicated on the car display panel. If there is a difference in the reading of any sensor, this indicates that it is faulty.
It is important to note that there are other ways to identify a faulty TPMS sensor. For example, you can use a TPMS diagnostic tool or perform trial and error by filling and releasing air from the tyres. Additionally, you can take your car to a tyre store that has transmitter detectors to have it checked by a professional.
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TPMS scan tool
A TPMS scan tool is a device used to identify issues with a vehicle's Tire Pressure Monitoring System (TPMS). The TPMS is responsible for monitoring the vehicle's tire pressure and alerting the driver if the tires are underinflated or overinflated.
There are several TPMS scan tools available on the market, and they can vary in terms of features and compatibility. Some TPMS scan tools are designed for specific vehicle makes or models, while others are universal and can be used on multiple vehicle types. When choosing a TPMS scan tool, it is important to consider the compatibility with your vehicle and the specific features you require.
Some popular TPMS scan tools include:
- Autel MaxiTPMS TS508WF: This tool can activate, relearn, and diagnose all sensors, as well as programme Autel MX-Sensors. It also offers quick and advanced modes for reading and clearing DTCs.
- XTOOL TP150: This tool is designed for activating, relearning, and resetting TPMS sensors. It can also programme XTOOL TS100 sensors and diagnose TPMS issues.
- FOXWELL T2000 Pro: This tool is designed for activating and relearning TPMS sensors. It can also read and clear DTCs, as well as read sensor data. However, it is only compatible with T10 sensors (315/433MHz).
- Thinkcar Thinkscan 600: This is an OBD2 scanner and code reader that offers ABS/SRS, oil, TPMS, and brake reset diagnostics for all brands.
- MUCAR CS4: This OBD2 scanner and code reader offers diagnostics for oil, EPB, SAS, TPMS, and throttle body reset codes.
- Autel MaxiCOM MK808TS: This car diagnostic scan tool provides OE-level TPMS service and OBD2 scanning with 28+ service functions, including AutoAuth for FCA SGW.
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Illuminating TPMS warning light
An illuminated TPMS warning light is a clear indicator that there is an issue with your tire pressure. The TPMS, or Tire Pressure Monitoring System, is a mandatory feature on all new vehicles in the US since 2008. It is a safety feature that alerts drivers to changes in their tire pressure, which can lead to unsafe driving conditions and increased fuel consumption.
The TPMS warning light is located on the vehicle's dashboard and should only illuminate when tire pressures are incorrect. When the TPMS light flashes, it means that one or more tires need to be inflated. However, it's important to note that the warning light usually only turns on when the PSI levels are dangerously low, typically at least 25% below the correct pressure.
If you see the TPMS warning light, it is important to stop and check your tire pressure levels as soon as possible. You can do this by using a tire pressure gauge or visiting a gas or service station. After inflating your tires to the recommended pressure, the TPMS light should turn off. If it doesn't, you may need to drive your car at 50 miles per hour for around 10 minutes, then turn off the car and start it again. If the TPMS light still doesn't turn off, refer to your vehicle's manual for instructions on resetting the TPMS system or consult a tire professional.
It is important to note that the TPMS system is not a substitute for regular tire pressure checks. While it alerts you to serious problems, your tires can still be moderately underinflated or overinflated without setting off the warning system. Therefore, it is recommended to check your tire pressure monthly and before long trips to ensure optimal safety and performance.
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Jerky steering wheel
A jerky steering wheel could be a sign of a faulty throttle position sensor (TPS). The TPS is an important sensor that allows your engine to maintain the proper amount of air. When the gas pedal is pressed, the throttle body unit's valve opens, and the TPS adjusts the engine intake manifold accordingly. This sensor is essential for a correct mixture of air and fuel, and it helps keep your idling and acceleration smooth.
A malfunctioning TPS will relay bad data to your car's computer, which usually results in poor fuel economy. Some symptoms of a faulty TPS include:
- Unexplainable bucking and jerking in the vehicle
- Sudden engine stalling without any apparent reason
- Hesitation while accelerating
- Sudden surges in speed while driving
- Intermittently flashing check engine light for no apparent reason
- Difficulties in changing gears
- A drastic drop in fuel economy
If you are experiencing any of these issues, it is recommended to consult a mechanic or use a multimeter to check for electrical connection issues.
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Frequently asked questions
If you see a warning light on your dashboard, this could be a sign that your TPMS sensor is faulty. You can also try filling and releasing air from your tyres one by one and checking the car display panel. If a tyre doesn't send a message, it may have a defective sensor.
A faulty TPMS sensor can cause issues such as incorrect alerts or warnings, increased fuel consumption, and a jerky steering wheel.
You can either replace the faulty sensor or all of the sensors. It is recommended to replace all sensors as they may all be close to the end of their lifespan.
The cost of replacement depends on the make and model of your car. It typically ranges from $80 to $250, and for some cars, it can be between $231 and $301.
