O2 Oxygen Sensor Upstream Downstream for Toyota RAV4 (2001-2003) 2.0L

Direct-Fit O2 Sensor Kit for 2001-2003 Toyota RAV4 (XA20)

What it Does: This 4-piece oxygen sensor kit monitors pre- and post-catalyst exhaust oxygen levels on the 2001-2003 Toyota RAV4 (XA20) 1AZ-FE 2.0L to maintain closed-loop fuel trim precision.

The Stock Toyota RAV4 O2 Sensor Failure

On the XA20 RAV4 equipped with the dual-bank 1AZ-FE 2.0L manifold, factory upstream air-fuel ratio sensors and downstream heated O2 sensors endure severe thermal cycling directly off the cylinder head. Over time, internal platinum heater elements fatigue and open-circuit, while silicon, carbon, and oil ash foul the ceramic sensing thimble. Once response rates degrade, the ECM loses closed-loop fuel trim authority, triggering codes like P1135, P1155, P0141, and P0161.

Common Symptoms of Failing OEM Oxygen Sensors

• Check Engine Light: Triggers P1135, P1155, P0141, or P0161 from open heater circuits.
• Fuel Trim & Idle Instability: Fouled elements delay switching, causing rough idle and P0171 lean codes.
• Emissions & MPG Loss: Open-loop enrichment increases fuel consumption and fails OBD-II readiness monitors.

The Direct-Fit Upstream & Downstream Solution

Replacing all four sensors as a matched set restores balanced Bank 1 and Bank 2 feedback across both exhaust runners. Each sensor utilizes a corrosion-resistant stainless steel housing, laser-welded perforated shield, and fast-lightoff ceramic heater element engineered to match OEM resistance specs for 89467-42010, 89467-42020, 89465-42090, and 89465-42100. Pre-terminated factory weatherpack connectors and OEM-length heat-sleeved leads ensure true plug-and-play installation into stock exhaust manifold bungs without wire splicing.

What's Included

• 2 Upstream Oxygen Sensors
• 2 Downstream Oxygen Sensors

Technical Specifications

Compatibility

• 2001-2003 Toyota RAV4 2.0L (1AZ-FE — Confirm engine before ordering)

Frequently Asked Questions & Fitment Warnings

Does this fit the XA20 RAV4?

Yes. This is a direct fit for the 2001-2003 Toyota RAV4 equipped with the 1AZ-FE 2.0L engine. Excludes 2004-2005 XA20 models equipped with the 2.4L 2AZ-FE engine.

Will this clear P1135/P1155 codes?

Yes. Replaces faulty upstream A/F and downstream HO2S units causing P1135, P1155, P0141, or P0161; clear stored DTCs post-install.

Are connectors plug-and-play?

Yes. Pre-terminated OEM connectors eliminate wire splicing; clean exhaust bungs and torque sensors cleanly to 30 lb-ft.

The Toyota Precision Standard

Engineered to restore factory 1AZ-FE fuel control, this matched 4-sensor kit eliminates skewed fuel trims and recurring emissions faults. Expect crisp closed-loop ECU response and CEL-free daily drivability.