Air‑Fuel Ratio Sensor for Toyota Engines ⚙️

Keep the mixture precise with this OEM‑grade upstream A/F sensor. It feeds the ECU live data so your engine makes strong power, saves fuel, and meets emission rules . Perfect for drivers who want smooth idle, clean starts, and long catalyst life.

Why you need it

The sensor measures how rich or lean the exhaust is. With correct feedback, the ECU holds the ideal 14.7:1 mix, protecting the catalytic converter and keeping performance sharp.

How it works

This wideband lambda uses a pump cell and reference cell to track oxygen in exhaust. A fast heater brings it to temperature quickly, then the ECU reads tiny current changes to adjust injector pulse in real time .

What happens if it’s bad

Expect high fuel use, rough idle, lazy throttle, sulfur smell, dark exhaust, and a check‑engine light. Long term, the catalyst can overheat or clog, and emissions will rise ⚠️.

Tech tips

• Install on the upstream (pre‑cat) position
• Do not touch the tip; avoid silicone or oil contamination
• Tighten to spec; use only sensor‑safe anti‑seize if needed
• Clear codes and perform a short relearn drive

Compatibility

• Land Cruiser