2026-10-08 · 5 min read
Mitsubishi Xpander O2 Sensor Malaysia
Xpander has upstream (air-fuel ratio sensor pre-cat) and downstream (post-cat monitor) O2 sensors. Common failures: P0135 or P0141 (sensor heater circuit fault), P0420 (catalyst efficiency below threshold). Upstream sensor is the more critical one — affects fuel economy and emissions. OEM or Denso/NTK equivalent recommended for accurate fuel management. RON95 use can accelerate upstream sensor fouling.
Xpander O2 Sensor
- Front (upstream) O2 sensor monitors combustion — directly affects fuel economy
- Rear (downstream) sensor monitors catalytic converter efficiency
- Failing O2 sensor: increased fuel consumption, rough idle, P0131–P0141 codes
- Replace at ~100,000 km or on fault code — affordable part