Parts for your 2005 Toyota Kluger-Oxygen sensor

2005 Toyota Kluger Oxygen Sensor — Purpose, Fitment and Servicing Advice

Based on technical references including the Toyota Repair Manual for 2004–2007 Kluger/Highlander (2AZ-FE 2.4L and 3MZ-FE 3.3L engines), the Toyota Electronic Parts Catalogue, and the Denso Australia/NZ application guide, the 2005 Toyota Kluger is fitted with oxygen-sensing hardware. It uses wideband Air–Fuel Ratio (A/F) sensor(s) upstream and conventional Heated Oxygen Sensor(s) downstream of the catalytic converter. So yes, an oxygen sensor is relevant and used on this model.

On the 2005 Kluger, the upstream A/F sensor continually reports how rich or lean the engine is running so the ECU can trim fuel precisely. That keeps fuel economy tidy, emissions low, and throttle response smooth. The downstream oxygen sensor monitors catalytic converter efficiency, helping the ECU verify that the cat is doing its job and flagging issues before they become bigger problems.

There’s no strict time-based replacement interval in Toyota servicing schedules, but these sensors are wear items. Many owners see them last 160,000–200,000 km or more, depending on fuel quality and driving. Tell-tale signs it’s time to replace include a Check Engine Light with codes like P0133, P0135, P0136, P2195 or P0420, rough idle, increased fuel use, or a whiff of sulphur from the exhaust. If one sensor fails on a high‑km Kluger, it’s sensible to evaluate the others as well, especially if the vehicle has the V6 (with Bank 1 and Bank 2 upstream sensors).

When replacing, match the exact sensor type and position: upstream is a wideband A/F sensor (Sensor 1), downstream is a traditional O2 sensor (Sensor 2). Use quality parts (Denso is OE on Toyota), and don’t interchange A/F and O2 sensors—they’re different internally. A few practical tips make the job smoother:

• Confirm bank and sensor location: Sensor 1 is before the cat