Parts for your 2018 Suzuki Splash-Oxygen sensor

2018 Suzuki Splash oxygen sensor — what it does and when to replace it

Yes, the 2018 Suzuki Splash uses an oxygen sensor (lambda sensor). Suzuki’s workshop literature for the Splash/Ritz with K-series petrol engines (K12B/K10B) shows a heated oxygen sensor before the catalytic converter and a second sensor after it, used for mixture control and catalyst monitoring. This layout is also reflected in Suzuki’s parts catalogues and major OEM sensor application guides from Denso, NTK and Bosch that list sensors for Splash/Ritz 1.0/1.2 petrol models. Given emissions requirements (Euro 4/5, BS-IV in some markets), an oxygen sensor is essential on these engines, so it’s absolutely relevant on late-registered 2018 vehicles.

On the 2018 Splash, the oxygen sensor feeds live exhaust data to the engine control module, helping it constantly fine-tune the air–fuel mix. That keeps fuel use in check, trims emissions, and maintains smooth drivability. The upstream sensor (ahead of the cat) handles the real-time fuelling corrections, while the downstream sensor (after the cat) checks catalytic converter efficiency and flags issues if the cat or mixture control isn’t up to scratch.

They’re hardy but not immortal. Contaminants (oil, coolant, silicone sealants), exhaust leaks, age and heat all take a toll. When they drift out of spec, the Splash can drink more fuel, feel a bit doughy off the line, or throw a Check Engine Light with codes like P0130–P0161. If the cat is marginal, the downstream sensor will be the one to dob it in.

There’s no strict time-based service interval, but it’s sensible to think about testing or replacement somewhere around 150,000–200,000 kilometres, or earlier if symptoms pop up. During regular servicing, a quick OBD scan and a visual once-over under the bonnet and along the exhaust help catch problems before they snowball.

• Watch for: higher fuel use, rough idle, exhaust smell, failed WOF/rego emissions checks, and sensor-related fault codes.
• Good practice: fix any exhaust leaks ahead of the cat, avoid silicone-based sprays/sealants near the intake, and keep the engine in good tune (plugs, coils, no vacuum leaks).
• Replacement tips: use a quality direct-fit sensor spec’d for the Splash, most new sensors have anti-seize pre-applied—don’t add extra unless the maker says so. Always tighten to the workshop spec and clear fuel trims after fitting.

If the light’s on, a mechanic can compare live sensor waveforms and heater operation to confirm whether it’s the sensor itself, wiring, or something upstream causing grief. That saves throwing parts at it and keeps the little Suzuki running sweet and sipping petrol like it should.

How many oxygen sensors does a 2018 Suzuki Splash have?

Most petrol Splash models with the K-series engine run two: one upstream (pre-cat) and one downstream (post-cat). Some market variations exist, so it’s worth checking by VIN, but two is the usual setup for Euro 4/5 compliance.

When should the Splash’s oxygen sensor be replaced?

There’s no fixed schedule, but many are ready for replacement around 150,000–200,000 kilometres. Replace sooner if there’s a Check Engine Light with O2-related codes, rising fuel use, or rough running. A quick OBD scan during service is the best way to judge actual condition.

Can a universal oxygen sensor be used on a Splash?

It can, but a direct-fit sensor from a reputable brand is the safer bet. Universal units need splicing and can introduce wiring errors or connector issues. Using the correct connector, heater spec and lead length avoids repeat faults and saves time.