1821378R11 Suzuki SENSOR,OXYGEN RR, Price: 133.84$, Weight: 0.125kg

Rear Exhaust Oxygen Sensor for Suzuki

This rear oxygen sensor is a key emissions and fuel-control part. It sits in the exhaust stream after the catalytic converter and “sniffs” leftover oxygen in the gases. The engine computer uses this signal to confirm the catalyst is working and to keep the system within clean-air limits. ✅

Why this sensor is needed

Modern Suzuki engines rely on accurate feedback to maintain low emissions and stable drivability. A healthy rear sensor helps prevent hidden catalyst issues, keeps the ECU logic correct, and supports smooth inspection results. 🌿

How it works

Inside the probe is a heated ceramic element. As exhaust oxygen changes, the sensor voltage changes too. The built-in heater brings it up to operating temperature fast, so the ECU can read it quickly and adjust monitoring strategies. ⚙️

If it’s broken or weak

Common symptoms include a check engine light, poor emissions test, increased fuel use, rough idle in some cases, and catalyst-efficiency fault codes. Ignoring it can lead to incorrect fuel corrections, premature catalytic converter damage, and costly repairs. 🚗