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The 21176-0016 throttle position sensor is the OEM-spec TPS for three Kawasaki off-road platforms: KX250F (2004–2010), KX450F (2006–2015), and KLX450R (2008–2011). It runs a 3-wire potentiometer layout — 5V reference, signal return, sensor ground — following SAE J1930 diagnostic nomenclature and ISO 15031-6 DTC mapping protocols.

Fitment: Which Bikes Take the 21176-0016

Direct bolt-on coverage looks like this:

• Kawasaki KX250F — 2004–2010, carbureted with CDI-driven ignition mapping
• Kawasaki KX450F — 2006–2015, EFI architecture
• Kawasaki KLX450R — 2008–2011, EFI architecture

Suzuki cross-compatibility is built in: the sensor also fits the RM-Z250 (2004–2009) and RM-Z450 (2005–2009) when equipped with the Keihin FCR-MX carburetor with TPS. These machines share the same Keihin FCR/TPS architecture as the Kawasaki models.

Kawasaki superseded the part to 21176-0714 in its global parts system, validating a service horizon through 2030. That lifecycle aligns with Kawasaki Heavy Industries' 15-year legacy parts commitment for the KX-F/KLX-R platforms.

Later Models: The 21176-0129

The 21176-0016 bolts directly onto 2004–2015 model-year platforms. For later generations, Koeep lists a separate 21176-0129 sensor covering the 2009–2015 KX450F and 2013–2016 KX250F — match the part number to your model year before ordering. US buyers can also use the dedicated US listing of the same 21176-0016 sensor.

2026 Material and Architecture Updates

The 2026 production run swaps the legacy conductive-plastic track for a cermet (ceramic-metallic) thick-film resistive element. The payoff is a 3× improvement in wear-cycle endurance, tested to 5 million full-sweep cycles per SAE J2577. The change targets the elevated under-tank thermal loads on the KX450F EFI platform, where continuous temperatures routinely exceed 125°C during slow-speed technical riding.

Contactless-Ready Hybrid Interface

Externally, nothing changes: the sensor keeps the 3-pin Sumitomo MT090 sealed connector, with a pinout identical to OEM Kawasaki harnesses from 2004 through 2015, so it plugs into your stock wiring. Inside, the wiper assembly now uses a dual-redundant contact arm, pre-engineered for the contactless Hall-effect retrofit modules gaining traction under 2026 MxGP and AMA Supercross regulations.

Thermal Compensation Circuit

An integrated NTC thermistor network compensates temperature drift in real time, holding output within ±0.03V across −40°C to +150°C. That kills the voltage offset behind false DTC P0121 (TPS Range/Performance) on cold starts — a known issue on the KLX450R at altitude.

Vibration-Hardened Mounting Base

The mounting flange is glass-fiber reinforced PBT with integrated brass insert bushings, torqued to 3.5 N·m. This removes the micro-fretting that historically induces P2135 (TPS A/B Correlation) faults under sustained high-RPM running on the KX250F.

Technical Specification Matrix

One 2026 diagnostic note before the numbers:

Failure Symptoms: Carbureted vs EFI

KX250F (2004–2010): Timing Data, Not Fuel

On the carbureted KX250F, the TPS feeds ignition timing advance data to the CDI — not fuel delivery. Early failure shows up four ways:

• Off-idle hesitation or bog at 1/8–1/4 throttle
• Intermittent high-RPM misfire above 10,500 RPM
• Hard starting when hot, from insufficient timing retard
• A hanging idle that never returns to baseline

The KX250F CDI will not illuminate a MIL, so diagnosis means an analog voltmeter back-probing the signal wire at the CDI connector. Expect 0.58–0.62V at closed throttle. Any reading outside that window means it's time to fit a new 21176-0016.

KX450F / KLX450R: Thermal Drift

The signature EFI failure is a P0121 that appears only after roughly 20 minutes of riding. A failing sensor's resistance deviation climbs above 115°C — classic thermal drift. The 2026 KX450F ECU, via KDS v6.0, now logs a thermal coefficient variance PID; once it exceeds 4.7%/100°C, the code triggers.

The fix: a fresh sensor plus a hot-soak calibration with the engine at 95°C coolant temperature to set the correct thermal baseline. The cermet track in the current 21176-0016 is formulated specifically to resist this drift mode.

Calibration After Installation Is Mandatory

Every platform needs calibration. The procedure differs by model:

• KX250F (2004–2010): Loosen the TPS Torx screws, rotate the sensor body until closed-throttle voltage reads 0.60V ±0.02V at the CDI signal wire (Yellow/Blue trace), then tighten to 2.5 N·m.
• KX450F (2006–2015) / KLX450R: Use Kawasaki KDS software or an OBD-II scanner in "TPS Learn" mode. The ECU must register the 0° and 90° positions before the adaptive fuel map engages.

Skip it on an EFI bike and the ECU defaults to a limp-home alpha-N map. You get rich fueling and flame-out on deceleration.

2026 Standards and DTC Reference

Standards Compliance

The sensor complies with SAE J1455 environmental practices, uses a PPS/GF30 housing rated UL 94 V-0, and carries contact assemblies manufactured to IPC J-STD-001 Class 3 for 2026 supply-chain traceability. Supply voltage is ECU-regulated at 5.0V DC ±0.25V per ISO 16750-2:2026, with a −40°C to +150°C envelope per ISO 16750-4:2026.

The sealed Sumitomo MT090 connector surpasses IP67 ingress protection per IEC 60529:2026 — a key spec for the KLX450R's enduro-duty water crossings.

DTC Codes and Aftermarket ECU Support

The diagnostic footprint covers P0120 (Circuit Malfunction, open/short detection), P0121 (Range/Performance, rationality vs. MAP/MAF), P0122 (Low Input, ≤0.15V detected), P0123 (High Input, ≥4.85V detected), and P2135 (A/B Correlation, dual-track mismatch on EFI models). KDS v6.0 adds a proprietary P0124-D (TPS Intermittent/Thermal Drift) code for field diagnostics.

The analog 0–5V output works with 2026 aftermarket ECUs that accept 0–5V TPS input: Vortex X10, GET SX1, and Athena GET. On OEM 2026 ride-by-wire ECUs, the sensor serves as the redundant pedal-position cross-reference in dual-track safety architectures under ISO 26262 ASIL-B, and its 0.6V–4.5V sweep integrates with CAN FD (CAN with Flexible Data-Rate) gateway modules via ADC conversion per ISO 11898-1:2026.

Frequently Asked Questions