Walker 256-1148 Engine Oil Pressure Switch

Engine Oil Pressure Switch for OE-Style Monitoring

Walker 256-1148 is an engine oil pressure switch built to monitor lubrication pressure and send the proper signal to the ECU or dash warning circuit when pressure drops below safe limits. It is an OE replacement for vehicles that rely on a single-terminal switch with a circular connector and factory-style electrical response.

Compatible With select Audi, Ford, Honda, Acura, Mazda, and Chevrolet applications, including Audi A4, Audi Q5, Audi Q7, Ford F-150, Honda S2000, and Acura NSX. The Walker 256-1148 is built for direct replacement service where accurate oil-pressure warning function is required.

Key Features

• Steel construction with a steel finish for engine-bay durability
• Single-terminal design with male connector and female terminal gender
• Circle connector shape for OE-style electrical connection
• Matches OE pressure thresholds, thread size, and terminal type
• Built for high-temperature, oil-exposed operating conditions
• Direct-fit replacement for factory oil pressure switch locations

Detailed Description

Walker Products 256-1148 is engineered as an OE replacement engine oil pressure switch for vehicles that use a warning-light or ECU input to monitor oil pressure. When pressure falls below the calibrated threshold, the switch sends the signal needed to trigger the dashboard warning system or engine control response. This makes it a critical part of the lubrication warning circuit on applications such as the Honda S2000, Acura NSX, and Audi A4.

This part cross-references PS138 for the same application. The switch is manufactured to match factory specifications for fit and electrical behavior, with a steel body and OE-style connector layout for straightforward installation in the original mounting location.

Common Issues This Part Can Address

• Oil warning light flickering during normal driving
• False low-oil-pressure warnings on the dash
• No warning signal when actual oil pressure drops
• Intermittent oil pressure switch electrical response
• Faulty sender behavior after heat and oil exposure

Installation Notes and Tips

Install the switch in the factory oil pressure port, typically on the engine block or oil filter housing, and connect it to the existing wiring without modification. Verify the connector shape, terminal style, and pressure specification before installation. For fitment-specific applications, confirm the vehicle year and engine configuration, including notes such as 2.15-2.95 BAR or stamped reference numbers where listed.

• Fits 2018-2021 Ford F-150, N/A
• Fits 2017-2020 Audi A4, N/A
• Fits 2017-2020 Audi A4 allroad, N/A
• Fits 2017-2020 Audi A4 Quattro, N/A
• Fits 2018-2020 Audi A5 Quattro, N/A
• Fits 2018-2020 Audi A5 Sportback, N/A
• Fits 2019-2020 Audi A6 Quattro, N/A, Stamped #06K 919 081 D
• Fits 2018-2020 Audi Q5, N/A
• Fits 2020-2021 Audi Q5 PHEV, N/A
• Fits 2017-2019 Audi Q7, N/A, 2.15-2.95 BAR
• Fits 2020-2021 Audi Q7, N/A
• Fits 2000-2009 Honda S2000, N/A
• Fits 1997-2005 Acura NSX, N/A
• Fits 1997-2001 Honda Prelude, N/A
• Fits 1992-1994 Honda Prelude, N/A
• Fits 1997 Honda Accord, N/A
• Fits 1995-1996 Acura NSX, N/A, Vendor:DENSO
• Fits 1995-1996 Honda Accord, N/A, Vendor:DENSO
• Fits 1995-1996 Honda Prelude, N/A, Vendor:DENSO
• Fits 1991-1994 Acura NSX, N/A, For Light
• Fits 1986-1990 Acura Legend, N/A
• Fits 1986-1989 Mazda 626, N/A
• Fits 1988-1989 Mazda MX-6, N/A
• Fits 1981-1986 Chevrolet Chevette, N/A, w/ Light
• Fits 1975-1982 Chevrolet LUV, N/A, w/ Light

Quality Assurance

Walker Products manufactures this oil pressure switch to OE replacement standards for pressure threshold, thread fit, terminal configuration, and electrical response. The steel construction and oil-resistant, high-temperature design support consistent operation in demanding engine environments.