4-Pin 7283-7040-10 Yazaki Waterproof O2 Sensor Connector – Toyota / Nissan Female

Direct-fit replacement for Yazaki OEM part number 7283-7040-10, the 4-pin waterproof female socket connector used for oxygen (lambda) sensor harness connections on Toyota and Nissan vehicles. The 7283-7040-10 is the female socket (sensor side); the mating male plug on the vehicle harness is 7282-7040-10.

Key Specifications

• OEM Part Number: 7283-7040-10 (female socket)
• Mating Male: 7282-7040-10
• Pin Count: 4
• Gender: Female socket (with wire)
• Series: Yazaki 090 waterproof series
• Wire Gauge: 18 AWG (0.5 mm²)
• Wire Length: 5.5 inches (140 mm)
• Waterproof Rating: IP68
• Housing Material: PA66 glass-filled nylon
• Terminal Material: Copper alloy, tin-plated
• Current Rating: Up to 10A per pin

O2 Sensor Pin Assignment (4-Pin Yazaki)

Compatible Vehicles

• Toyota: Camry, Corolla, RAV4, Hilux, Land Cruiser – upstream and downstream O2 sensor harness
• Nissan: Altima, Sentra, X-Trail, Navara – oxygen sensor wiring
• Lexus: IS, ES, RX – shared Toyota platform O2 sensor harness
• Infiniti: G35, FX35 – shared Nissan platform

Fault Codes Linked to O2 Sensor Connector Failure

• P0030 / P0050 – O2 Sensor Heater Control Circuit (Bank 1/2)
• P0031 / P0051 – O2 Sensor Heater Circuit Low (open at heater pins)
• P0131 / P0151 – O2 Sensor Circuit Low Voltage
• P0136 / P0156 – O2 Sensor Circuit (downstream sensor)

Frequently Asked Questions

Q: What is the difference between 7283-7040-10 and 7282-7040-10?
A: 7283-7040-10 is the female socket (sensor side); 7282-7040-10 is the male plug (harness side). In the Yazaki 7282/7283 series, 7282 always denotes the male plug and 7283 always denotes the female socket.

Q: Can a bad O2 sensor connector cause a rich condition?
A: Yes. An open circuit at the O2 sensor connector causes the ECM to lose lambda feedback and default to open-loop fueling, typically resulting in a rich condition (P0172/P0175) and increased fuel consumption.

Q: What crimping tool is needed?
A: Use a ratchet crimper for 0.5mm² (18 AWG) Yazaki 090 terminals – Hozan P-706 or Engineer PA-09.

Package Contents

1 × 4-Pin Female Connector (7283-7040-10) with 18 AWG wire and terminal insert