Parts for your 2014 Suzuki Sx4-Throttle position sensors

2014 Suzuki SX4 throttle position sensor — fitted, what it does, and how to look after it

On the 2014 Suzuki SX4, a throttle position sensor (TPS) is absolutely used. Factory technical literature for the SX4/SX4 S-Cross (2013–2014) describes an electronic throttle body with an internal throttle valve position sensor (often two redundant tracks), and the model’s OBD-II fault list includes TPS-related codes such as P0121–P0123, P0221 and P2135. Suzuki workshop manuals and Denso engine management documentation both note that the TPS is integral to the throttle actuator assembly, not a separate bolt-on sensor. So yes, this model relies on a TPS as part of its drive-by-wire system.

On this SX4, the TPS tells the engine computer exactly how far the throttle plate is open. The ECU cross-checks this with the accelerator pedal position, then trims fuel, spark and idle speed, and coordinates cruise control and transmission behaviour. Being built into the throttle body improves accuracy and reliability, which is why Suzuki doesn’t list a separate TPS for this year.

There’s no routine replacement interval for the TPS, but it should be considered during regular servicing. If the car shows a rough or hunting idle, sluggish response, sudden limp-home, poor fuel economy, or lights up the MIL/ESP lamps, a scan of live data for “Throttle Position” and “Accelerator Pedal Position” is the first port of call. Mismatched or jumpy signals point to a problem. Common stored codes include P0121/P0122/P0123, P0221 and P2135.

• Care tips: keep the air filter fresh and avoid over-oiling aftermarket filters, as oil mist can contaminate the throttle bore and sensor tracks.
• Cleaning: if the throttle plate is gummed up, remove the intake duct and gently clean the bore with proper throttle body cleaner. Don’t force the plate by hand and don’t flood the actuator, light sprays and lint-free swabs do the trick.
• Electrical checks: inspect the throttle body connector for corrosion or a loose fit. A stable 5 V reference and good ground are essential.
• Replacement: on the 2014 SX4, the TPS is not sold separately—replace the throttle body assembly if the sensor is faulty. Fit a new gasket, check for vacuum leaks, then perform an idle relearn/ETC calibration with a professional scan tool. A short road drive with varied throttle usually completes adaptation.

Done right, the SX4’s electronic throttle and its TPS give crisp response, steady idle and predictable fuel economy over hundreds of thousands of kilometres.

Popular questions

Does the 2014 Suzuki SX4 have a separate TPS I can replace by itself?
For this model year, the throttle position sensor is integrated into the electronic throttle body. Suzuki’s service information specifies replacement of the complete throttle body assembly if the TPS fails or is out of range, rather than replacing a standalone sensor.

What fault codes point to a TPS issue on a 2014 SX4?
Typical TPS-related codes include P0121 (range/performance), P0122 or P0123 (low/high input), P0221 (sensor 2 range/performance) and P2135 (throttle/pedal position correlation). These should be diagnosed with live data to confirm whether the fault is the sensor, wiring, or a correlation issue with the accelerator pedal sensor.

Is a relearn needed after fitting a new throttle body?
Yes. After installing the new unit, a throttle/idle relearn should be carried out. Many scan tools offer an ETC or idle learn function for Suzuki. A proper warm-up and short drive cycle with light-to-moderate throttle usually finalises adaptation so idle and response settle correctly.