Parts for your 2017 Mitsubishi Eclipse cross-Oxygen sensor

Oxygen sensor for the 2017 Mitsubishi Eclipse Cross

The oxygen sensor is absolutely fitted to the 2017 Mitsubishi Eclipse Cross and is very much relevant. Technical references that confirm this include the Mitsubishi Motors Eclipse Cross service manual for the GK/GL series (4B40 1.5‑litre turbo petrol) under Engine Control, which specifies a wideband air‑fuel ratio (A/F) sensor upstream and a heated oxygen sensor downstream for catalyst monitoring, as well as ADR 79/04 (Euro 5) emissions requirements that necessitate closed‑loop oxygen sensing. Supplier documentation for wideband sensors (e.g., DENSO A/F sensor technical notes) aligns with this setup.

On the Eclipse Cross, the front wideband A/F sensor continually measures oxygen content in the exhaust so the ECU can trim fuelling on the fly, keeping the mixture spot‑on for performance, economy, and emissions. The rear O2 sensor sits after the catalytic converter and keeps an eye on catalyst efficiency. Together, they help the 1.5T direct‑injection engine run clean and smooth, especially during cold starts and under boost.

They’re not a typical “replace every service” item, but they do wear. Heat cycles, fuel quality, silicone or coolant contamination, and oil ash can slow sensor response. Many workshops will inspect at each service for damage, chafed wiring, and exhaust leaks, and consider proactive replacement somewhere around the 160,000 km mark or when diagnostics flag slow response or heater faults.

• Common signs of a tired O2 sensor: poorer fuel economy, rough idle, hesitation, sulphur smell, and a check‑engine light (codes like P0133, P0134, P0420).
• Always fix exhaust leaks before the sensors, leaks can skew readings.
• Use OEM‑quality sensors, the front is a wideband type and not interchangeable with the rear.
• Avoid touching the sensing tip, don’t spray cleaners on it.
• When replacing, use an O2‑sensor socket, avoid twisting the harness, and verify if the new sensor is pre‑coated—most are, so no extra anti‑seize is needed.

After replacement, clear fault codes and complete a proper drive cycle so the ECU can relearn trims and run its catalyst monitors. Done right, the oxygen sensors help the Eclipse Cross deliver the best blend of Aussie and Kiwi commuting economy with weekend get‑up‑and‑go.

Popular questions about 2017 Mitsubishi Eclipse Cross oxygen sensors

How many oxygen sensors does a 2017 Eclipse Cross have?
The 1.5‑litre turbo petrol typically has two: a wideband A/F sensor before the catalytic converter and a conventional heated O2 sensor after it. Some markets and variants can differ, but this two‑sensor setup is the common AU/NZ configuration.

What’s a typical replacement interval or cost?
They’re generally replaced on condition, but many workshops see them needing attention around 160,000 km or later. In Australia and New Zealand, parts can range roughly from a couple of hundred dollars per sensor, with 0.5–1.0 hour labour each, depending on access and corrosion.

Can an oxygen sensor be cleaned instead of replaced?
No. If a sensor is contaminated or its heater or response is out of spec, cleaning won’t restore accuracy. Replacement is the reliable fix, followed by clearing codes and completing an OBD drive cycle.