Genuine Honda 37241-RNA-A01 Oil Pressure Switch (Denso) | Civic, Accord, CR-V + Acura

Genuine Honda 37241-RNA-A01 Oil Pressure Switch (Denso)

Oil pressure warning light on or flickering even though the oil level is correct? Or oil seeping from a small sensor on the engine block? On many Honda and Acura models the oil pressure switch itself is the usual suspect — it can fail electrically (false warnings) or start leaking oil past its body.

The Honda 37241-RNA-A01 is the genuine oil pressure switch (sending unit for the warning light), manufactured for Honda by Denso — the same part your dealer installs across a wide range of Civic, Accord, CR-V and Acura models.

OEM Part Numbers

• 37241-RNA-A01
• 37241RNAA01

Aftermarket Cross Reference

• STANDARD MOTOR PRODUCTS PS469
• STANDARD MOTOR PRODUCTS PS469T (T-Series professional line, same part)
• ROSTRA 501271

Common Symptoms of a Failed Oil Pressure Switch

• Oil pressure warning light on or flickering with a correct oil level
• False low-oil-pressure alarms, especially at idle
• Engine oil leaking from the switch body — a frequent failure mode on these models

Important: if the warning light is on, first verify actual oil pressure with a mechanical gauge. The switch only reports pressure — it cannot fix a genuine low-pressure condition.

Product Highlights

• ✔ Genuine Honda OEM part, OE-manufactured by Denso
• ✔ Cures false oil-light warnings caused by a failed switch
• ✔ Stops oil leaks from a weeping old switch
• ✔ Simple 1-pin screw-in unit
• ✔ One part number covers Civic, Accord, CR-V, Crosstour, Fit, CR-Z, HR-V and many Acura models

Condition

New Genuine Honda OEM part

Product Type

Oil Pressure Switch (oil pressure sending unit for the warning light)

Function

The oil pressure switch monitors engine oil pressure and switches the dashboard warning-light circuit when pressure falls below its threshold. On the Civic 1.8L it is located near the transaxle; on 2.4L engines (CR-V, Civic Si) it sits low at the rear of the block. Honda's install note recommends applying thread sealant or teflon tape to the threads during installation.

Compatible Vehicles

Model	Years
Honda Civic	2006–2021
Honda Accord	2008–2022
Honda CR-V	2007–2022
Honda Crosstour	2012–2015
Honda Fit / CR-Z / HR-V	select years
Acura CSX	2006–2011
Acura ILX	2013–2019
Acura RDX	2007–2012
Acura TLX	2015–2019
Acura TSX	2009–2014

Please verify fitment with your VIN before ordering.

Package Contents

• 1 × Genuine Honda 37241-RNA-A01 oil pressure switch

Technical Specifications

Brand	Honda
OE Manufacturer	Denso
Part Number	37241-RNA-A01
Alternate Part Number	37241RNAA01
Seller SKU	Honda_37241RNAA01
Product Type	Oil Pressure Switch
Connector	1 terminal
Dimensions	1.9 × 1.0 × 1.0 in
Weight	0.20 lb
Install Note	Honda recommends thread sealant / teflon tape on the threads
Manufacturer List Price (MSRP)	$91.12–$115.36
Condition	New

Warranty

Manufacturer warranty may vary by supplier, seller, and region. Please contact us before purchase if warranty confirmation is required.

Installation Video

▶ How to Replace Oil Pressure Switch 2012–2015 Honda Civic 1.8L — 1A Auto

FAQ

My oil light is on — will this switch fix it?

If actual oil pressure is normal (verify with a mechanical gauge) and the light is on or flickering, a failed switch is the likely cause and this part is the fix. If real pressure is low, diagnose the engine first.

Is this a genuine Honda part?

Yes. Genuine Honda part 37241-RNA-A01, OE-manufactured by Denso — dealer catalogs list it as “Switch Assembly, Oil Pressure (Denso)”.

Where is the switch located?

On the Civic 1.8L — near the transaxle; on 2.4L engines (CR-V, Civic Si) — low at the rear of the engine block.

Do I need sealant on the threads?

Yes — Honda's installation note recommends thread sealant or teflon tape on the threads.

Does it fit Acura models?

Yes — CSX 2006–2011, ILX 2013–2019, RDX 2007–2012, TLX 2015–2019 and TSX 2009–2014 use this same switch. Verify by VIN.

Why is my old switch leaking oil?

Leaking past the switch body is a common age-related failure on these Honda/Acura applications — replacing the switch resolves the leak.