5-Pin 1928405159 Bosch 1.2mm Waterproof MAF Sensor Connector – Buick / Chevrolet Air Flow Meter & Injector

Direct-fit replacement for Bosch OEM part number 1928405159, a 5-pin waterproof 1.2mm pitch connector used for mass air flow (MAF) sensor and fuel injector harness connections on Buick and Chevrolet vehicles. Bosch is the OEM supplier for MAF sensors and fuel injectors on many GM platforms – the 1928405159 is the Bosch connector housing used at these sensor interfaces.

Key Specifications

• OEM Part Number: 1928405159 (Bosch)
• Pin Count: 5
• Gender: Female socket (with wire)
• Terminal Pitch: 1.2mm
• Wire Gauge: 22 AWG (0.3 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 3A per pin (signal circuits)

MAF Sensor Pin Assignment (5-Pin Bosch)

Compatible Vehicles

• Buick: LaCrosse, Enclave, Regal – 2.0T and 2.4L MAF sensor harness
• Chevrolet: Malibu, Equinox, Cruze – 1.4T, 1.6T, and 2.0T MAF sensor connector
• GMC: Terrain – shared GM platform MAF harness
• Cross-reference: Verify OEM part number 1928405159 before ordering

Fault Codes Linked to 1928405159 Connector Failure

• P0100–P0103 – MAF sensor circuit faults
• P0110–P0113 – IAT sensor circuit faults (shared connector)
• P0171 / P0172 – System Lean/Rich (caused by MAF signal loss)

Frequently Asked Questions

Q: Can a bad MAF connector cause a lean condition on Chevrolet?
A: Yes. An open circuit at the 1928405159 connector causes the ECM to lose MAF data and default to a fixed fuel map, typically resulting in a lean condition (P0171) and rough idle under load.

Q: What crimping tool is needed for 1.2mm Bosch terminals?
A: Use a precision micro-crimper rated for 0.3mm² (22 AWG) – Engineer PA-09 or TE Connectivity 91516-1. Standard automotive crimpers will crush the 1.2mm terminal barrel.

Package Contents

1 × 5-Pin Female Connector (1928405159) with 22 AWG wire, rubber wire seals, and terminal insert