Honda thermostat 06193-6C1-305 with gasket – genuine Honda kit

Genuine Honda thermostat 06193-6C1-305 with gasket (complete assembly) designed for the latest e:HEV / e:PHEV hybrid powertrains in Accord, Civic, CR-V, Prelude and ZR-V models. The thermostat is responsible for maintaining the correct operating temperature of the engine and hybrid system, directly affecting performance, fuel economy and long-term durability.

This is a Honda OEM part, exactly the same specification as used on the production line. Using the original thermostat together with the dedicated gasket ensures a precise fit, proper sealing of the cooling system and predictable engine behaviour across a wide range of operating conditions.

Applications

Thermostat Honda 06193-6C1-305 with gasket is used in the following models:

• Accord e:HEV – 2023–2025 (USA),
• Civic 4D e:HEV – 2023–2024 (USA),
• Civic 5D e:HEV – 2023–2026,
• CR-V e:HEV – 2024–2026,
• CR-V e:PHEV – 2024–2026,
• Prelude – from model year 2026-,
• ZR-V e:HEV – 2023–2026.

Before ordering, it is recommended to check the VIN and part number against the Honda parts catalogue, especially for US-market vehicles (Accord / Civic 4D) or cars imported from other regions.

OEM reference numbers

Main OEM reference for the thermostat and gasket assembly:

• 06193-6C1-305 – thermostat with gasket, genuine Honda kit.

Part number 06193-6C1-305 is a complete kit number, which means it includes both the thermostat and the dedicated sealing gasket (o-ring / housing gasket). This eliminates the risk of reusing an old, hardened gasket and helps avoid leaks around the thermostat housing after installation.

When should the thermostat be replaced?

Even in modern e:HEV / e:PHEV systems, the thermostat is a wear item. Replacement should be considered if you notice for example:

• very slow engine warm-up, coolant temperature staying below normal range,
• coolant temperature fluctuating while driving (too low at times, then rising to high values),
• warning messages or fault codes related to the cooling system,
• poor cabin heating performance at low ambient temperatures,
• traces of coolant leakage around the thermostat housing.

On hybrid e:HEV / e:PHEV models, an improperly working thermostat can affect not only the combustion engine itself, but also hybrid control strategies, fuel consumption and overall comfort.

Installation and service tips

Replacement of the 06193-6C1-305 thermostat and gasket should follow the official Honda service procedure, especially on e:HEV / e:PHEV models where correct bleeding of the cooling system is critical. Basic recommendations:

• always use the new gasket supplied in the kit – do not reuse the old one,
• clean the mating surfaces of the housing and block / outlet from old gasket material and deposits before installation,
• tighten all bolts to the specified torque from the Honda service manual,
• use coolant that meets the Honda specification for your model,
• after installation, bleed the cooling system thoroughly and check for leaks,
• after the first drive, recheck coolant level, cabin heating performance and temperature gauge behaviour.

Due to the specifics of hybrid systems, installation is best carried out by a workshop familiar with Honda e:HEV / e:PHEV service procedures, especially if the coolant is being replaced at the same time.

FAQ – Honda thermostat 06193-6C1-305

Does this thermostat fit my Accord / Civic / CR-V / ZR-V e:HEV?

The safest way is to confirm fitment by VIN and the official Honda parts catalogue. Thermostat 06193-6C1-305 is used in: Accord e:HEV (2023–2025 USA), Civic 4D e:HEV (2023–2024 USA), Civic 5D e:HEV (2023–2026), CR-V e:HEV and e:PHEV (2024–2026), Prelude (from 2026-) and ZR-V e:HEV (2023–2026). If you are unsure, always verify the number in the Honda EPC before ordering.

Is the gasket included, or do I need to buy it separately?

Part number 06193-6C1-305 is a factory kit that includes both the thermostat and the correct sealing gasket. There is no need to purchase a separate gasket – everything required for installation is included.

Can I use an aftermarket thermostat instead of the genuine Honda part?

For modern e:HEV / e:PHEV systems, using a genuine Honda OEM thermostat is strongly recommended. It guarantees the correct opening temperature, flow characteristics and full compatibility with the cooling system control strategy. Cheap aftermarket thermostats can cause incorrect engine temperature, higher fuel consumption or warning messages.

Do I have to replace the coolant when changing the thermostat?

In practice, some coolant has to be drained when replacing the thermostat. If the coolant is already several years old or close to its service interval, it makes sense to combine thermostat replacement with a coolant change – you save time and avoid bleeding the system twice in a short period.