Second Hand Hyundai i20 Oxygen Sensor

Yes, petrol-engined Hyundai i20s are fitted with lambda/oxygen sensors as part of the exhaust emissions system — typically one upstream of the catalytic converter and one downstream. Diesel variants do not use oxygen sensors in the same way; diesel i20s use other emissions management components instead, so if you have a diesel i20 you are unlikely to need an oxygen sensor. Check your V5 or registration plate lookup to confirm your fuel type before searching.

The first-generation i20 ran from 2008 to 2014, and the second generation arrived from 2014 onwards with revised engines and updated emissions calibrations, meaning the two generations are not treated as interchangeable for exhaust sensors. Even where connectors look similar, the sensor calibration is tied to the engine management system and emissions era of each generation, so fitting a sensor from the wrong generation can trigger fault codes or cause an emissions-related MOT failure. Confirm with the breaker that the donor car shares your exact engine code and generation before buying.

Trim level does not affect oxygen sensor fitment on the i20 — the sensor is determined by the engine code and emissions specification, not whether the car was an S, SE, Premium, or N Line. A sensor pulled from a basic S-trim car with the same engine code and from the same generation is directly comparable to one from a top-spec Premium or N Line. The breaker should still confirm the engine code matches yours, but you can disregard trim differences when sourcing this part.

Yes, engine code is the single most important factor — different petrol engines in the i20 use sensors with different thread sizes, connector types, and calibrations, so a sensor from the wrong engine will not work correctly even if it physically fits. You can find your engine code on your V5C or by asking a breaker to check against your registration. Always provide your engine code when requesting a quote from a dismantler on Findapart.

Yes, Euro 5 and Euro 6 calibrated engines can use sensors with different output characteristics to meet their respective emissions thresholds, and fitting a sensor from the wrong emissions era may cause the engine management system to run incorrectly or fail an MOT emissions test. The i20 moved to Euro 6 compliance around the mid-2010s second generation, so a sensor from an earlier Euro 5 car should not be assumed to be a straight swap for a later Euro 6 model even if the engines appear similar. Confirm the emissions standard of the donor vehicle with the breaker against your own registration before purchasing.

Petrol i20s typically run two oxygen sensors: a pre-cat sensor upstream of the catalytic converter that controls the fuelling mixture, and a post-cat sensor downstream that monitors catalytic converter efficiency — they are not interchangeable with each other. The upstream sensor is more commonly the one that fails and triggers fault codes, but you should confirm which sensor position you need before contacting a breaker. When requesting a quote on Findapart, specify whether you need the upstream (pre-cat) or downstream (post-cat) sensor along with your engine code and year so the dismantler can pull the correct unit.