Parts for your 2020 Suzuki Splash-Knock sensor

2020 Suzuki Splash knock-sensor: what it does and when to service it

Based on Suzuki’s own technical literature and parts listings, the 2020-registered Suzuki Splash is equipped with a knock sensor. The Suzuki Splash workshop manual for K12B/K10B engines includes a Knock Sensor (KS) description and diagnostic routine, and the Suzuki Electronic Parts Catalogue lists a “SENSOR, KNOCK” for Splash applications. Major aftermarket catalogues (Bosch and NGK/NTK) also specify a knock sensor for the Splash 1.2 K12B and many 1.0 K10B variants commonly seen in Australia and New Zealand. While a few early-market 1.0 applications overseas omitted the sensor, vehicles supplied to or imported into AU/NZ for 2020 use are typically knock-sensor equipped.

On the 2020 Suzuki Splash, the knock sensor is the quiet achiever that listens for the tell-tale vibration of knock (pinging) in the engine block. When it detects that harsh combustion chatter, it lets the engine control unit trim ignition timing to protect the motor and keep it running sweet as. That means better driveability on hot days, fewer flat spots on hills, and peace of mind if the car cops a tank of average 91 RON.

As part of regular servicing, the knock sensor asks for very little. It’s a sealed piezoelectric device bolted to the block, so there’s no schedule to replace it like a spark plug or filter. What matters is the condition of the wiring, the cleanliness of the mounting pad, and the correct torque on the retaining bolt so it can “hear” properly. During a service, a quick visual once-over for loom chafe and oil contamination around the sensor’s base is smart, and any engine fault codes (especially knock-sensor circuit or correlation codes) should be scanned and addressed promptly.

Replacement is straightforward for a trained tech: disconnect the battery, unplug the connector, remove the bolt, clean the contact surface, fit the new sensor, and torque it to the specification in the Suzuki manual. Skipping the correct torque or leaving grime on the mating surface can dull its sensitivity. If the Splash is showing symptoms like a sudden lack of pep, poorer fuel economy, a glowing MIL, or audible pinging under load, a diagnostic scan and basic checks should be booked. Genuine or OE-quality sensors are the go-to, and it’s worth clearing codes and performing a road test after fitting to confirm the ECU’s happy.

• Typical symptoms of a dodgy knock sensor: check-engine light, sluggish performance, heavy timing retard, and occasional pinging.
• Best practice: inspect wiring/connector at each service and follow factory torque and cleanliness requirements if replacing.

Where is the knock sensor on a 2020 Suzuki Splash?

It’s typically mounted mid-block on the intake side, below the inlet manifold. Access varies by engine (K12B 1.2 vs K10B 1.0), but most techs reach it from above with the airbox or intake ducting out of the way. Always identify by part and connector before removal.

What happens if they keep driving with a faulty knock sensor?

The ECU will often default to safer, retarded ignition timing. That protects the engine but saps power and can lift fuel use. If the sensor signal is missing or unreliable, persistent knock under load might go unchecked—so it’s best to diagnose and repair rather than leave it.

Does the knock sensor need regular replacement?

No scheduled interval. It’s a fit-and-forget item unless it fails or is damaged. Prioritise inspection of the harness and correct mounting. If replacement is needed, use OE-quality parts and torque to spec so the sensor can do its job accurately.