Wideband A/F Sensor (Upstream) for Toyota

Keep your engine smart and clean with this wideband lambda sensor. It lets the ECU fine‑tune the fuel mix in real time, giving smooth idle, crisp throttle, better MPG, and lower emissions . It also protects the catalytic converter by keeping the mixture close to stoichiometric.

Why you need it

Modern engines depend on precise air‑to‑fuel control. This sensor feeds fast, accurate data so the ECU can adjust injectors on the fly. Result: steady power, clean exhaust, and fewer trips to the pump ⛽.

How it works

A built‑in heater brings the sensing element up to temp quickly. Inside, a pumping cell compares oxygen in the exhaust to a reference and the ECU reads the correction current. That current maps to lambda (rich/lean). Mounted before the catalytic converter, it reacts in milliseconds ⚙️.

What happens if it fails

Signs include check‑engine light, poor fuel economy, rough idle, hesitation, fuel smell, or sooty tailpipe. The ECU may default rich or lean, hurting performance and risking catalytic converter damage or overheating. Cold starts can get shaky, too ⚠️.

Tech tips

Install on a cool exhaust. Do not touch the tip. Start threads by hand, tighten to spec, and use sensor‑safe anti‑seize if not pre‑coated. Fix exhaust leaks and clear codes after install .

Compatibility

• Camry
• Solara