Second Hand Hyundai i20 Lambda Sensor

Yes, petrol-engined Hyundai i20s are fitted with lambda sensors (oxygen sensors) as standard — they sit in the exhaust system and feed the ECU information to control the air-fuel mixture and meet emissions requirements. Diesel i20s do not use a lambda sensor in the same way, relying instead on other sensors for emissions management, so if your i20 is diesel this is unlikely to be the part you need. If you are unsure, check your V5 or use your registration number when asking breakers for a quote.

The first-generation i20 ran from 2008 to 2014, and the second generation launched in 2014 — these cars used different engines and were built to different emissions standards (broadly Euro 5 for the later first-gen cars and Euro 6 for second-gen models), so the lambda sensors are unlikely to be directly interchangeable. Even if the sensor looks visually similar and has the same thread, fitting a sensor from the wrong emissions era can cause ECU faults and may affect your MOT result. Always confirm compatibility with the breaker using your exact registration and engine code before buying.

Trim level does not affect lambda sensor fitment on the i20 — what matters is the engine code, fuel type, and the emissions standard the car was built to, not whether it is a Classic, SE, Sport, or Premium. A sensor from any trim of the same engine and year range should be functionally identical, though cosmetic differences in surrounding exhaust components are possible. Tell your breaker your engine code (found on your V5 or inside the engine bay) and registration to make sure you get the right match.

This is a cross-generation question: 2013 falls in the first-generation i20 (2008–2014) and 2015 sits in the second generation (2014 onwards), which used a redesigned engine lineup and stricter Euro 6 emissions calibration. The sensors may look similar but are engineered for different ECU maps and emissions requirements, making a straight swap unreliable. Route this one to the breaker — give them both the donor and recipient registration numbers and engine codes so they can confirm whether the part will work and pass an MOT emissions test.

Petrol i20s typically have at least two lambda sensors — a pre-cat sensor upstream of the catalytic converter and a post-cat sensor downstream — and they are not the same part, so you need to specify which position you require when contacting a breaker. The pre-cat sensor is the primary one controlling fuelling, while the post-cat sensor monitors catalyst efficiency; fitting the wrong one in the wrong position can cause persistent engine warning lights. Check your diagnostic fault code first, as this will usually tell you which sensor position has failed and save time when getting quotes.

Yes, engine size and specifically the engine code matter because the 1.2 and 1.4 petrol units in the i20 are different engines with different exhaust configurations and ECU calibrations, so their lambda sensors are not guaranteed to interchange. Always quote the engine code rather than just the displacement — two cars both listed as 1.4 could have different engine codes with different sensor specifications. Give your breaker your registration number so they can confirm the exact engine fitted and match the sensor accordingly.