AW11 NTK Upstream Oxygen Sensor | 4A-GE / 4A-GZE (1985-89 MR2)

NTK Upstream Oxygen Sensor

For 1985–1989 U.S.-Market Toyota MR2 AW11 with 4A-GE or 4A-GZE, depending on configuration

Overview

This direct-fit NTK oxygen sensor replaces the upstream sensor used by the original fuel-control system. Its zirconia sensing element measures residual oxygen in the exhaust so the engine computer can adjust the air-fuel mixture.

Three application-specific versions cover the verified U.S.-market AW11 applications in this listing: 1985–1987 4A-GE one-wire unheated, 1988–1989 4A-GE four-wire heated, and 1988–1989 4A-GZE Supercharged four-wire heated.

Key Features

• Narrowband zirconia sensing for the upstream fuel-feedback circuit
• Direct-fit terminated connector for each verified application
• Application-specific harness length and mounting arrangement to match the factory sensor configuration
• One-wire unheated and four-wire heated versions matched to the appropriate AW11 engine and year application

Vehicle Fitment

Toyota MR2 (AW11 / MK1)

• 1985–1987 U.S.-Market — 4A-GE naturally aspirated; one-wire unheated upstream sensor
• 1988–1989 U.S.-Market — 4A-GE naturally aspirated; four-wire heated upstream sensor
• 1988–1989 U.S.-Market Supercharged — 4A-GZE; four-wire heated upstream sensor

Fitment Notes

• The 1988–1989 naturally aspirated and Supercharged sensors are different configurations. Select the option that matches the original 4A-GE or 4A-GZE application.
• The four-wire sensors are not conversions for the 1985–1987 one-wire electrical circuit.
• Engine swaps, harness conversions and altered exhaust interfaces require separate component matching; original chassis year alone does not establish fitment.

Product Specifications

• Brand: NTK
• Position: Upstream / pre-catalyst
• Sensor type: Narrowband zirconia
• Sensor-body hex: 22 mm

1985–1987 | One-Wire Unheated

• Harness length: 500 mm
• Wire / terminal quantity: 1 / 1
• Connector: Circular female housing with one male blade terminal
• Mount: Preassembled two-fastener flange

1988–1989 | Four-Wire Heated

• Harness length: 505 mm
• Wire / terminal quantity: 4 / 4
• Connector: Square female housing with four male blade terminals
• Mount: M18 × 1.5 threaded sensor with a separate two-hole flange adapter

1988–1989 | 4A-GZE Supercharged | Four-Wire Heated

• Harness length: 375 mm (14.75 in)
• Wire / terminal quantity: 4 / 4
• Connector: Square female housing with four male blade terminals
• Mount: Flange
• Thread size: M18 × 1.5

Available Configurations

1985–1987 | One-Wire Unheated

Includes:

• (1) Oxygen sensor with terminated harness and preassembled mounting flange
• (1) Loose flange sealing gasket

1988–1989 | Four-Wire Heated

Includes:

• (1) Oxygen sensor with terminated harness
• (1) Threaded flange adapter with bonded copper seal
• (1) Anti-seize packet

1988–1989 | 4A-GZE Supercharged | Four-Wire Heated

Includes:

• (1) Direct-fit heated oxygen sensor with terminated harness and mounting flange