Parts for your 2017 Honda Accord-Temperature sensors

2017 Honda Accord temperature sensors — what they do and how to look after them

Temperature sensors are absolutely fitted to the 2017 Honda Accord. Technical sources including the Honda Accord (2013–2017) Service Manual (Engine Cooling, Fuel & Emissions, Climate Control), Honda’s electronic parts catalogue, and professional repair databases (e.g., AlldataDIY and Mitchell1) all document multiple temperature sensors on this model. They’re integral to engine management, climate control, and driveline protection.

On a 2017 Accord (2.4L or 3.5L), the key temperature sensors typically include:

• Engine Coolant Temperature (ECT) sensor
• Intake Air Temperature (IAT) sensor (sometimes integrated with the airflow meter)
• Ambient (outside) air temperature sensor
• Transmission fluid temperature sensor (auto models)
• Cabin/evaporator temperature sensors for climate control

Each one has a job. The ECT sensor tells the ECU how warm the engine is so it can set cold-start fuelling, switch the radiator fans, and keep the temperature gauge honest. The IAT helps the ECU tweak spark and fuel for different air densities. The transmission fluid temperature sensor protects the gearbox and shapes shift timing. The ambient and cabin sensors let the climate control hold the temp you’ve dialled in and prevent fogging. All up, they keep the Accord running sweet and efficiently, whether it’s a frosty morning or a scorching arvo.

There’s no fixed replacement interval for these sensors, they’re serviced as needed. During routine servicing (every 10,000–20,000 kilometres or annually), it’s smart to:

• Scan live data cold and hot to confirm the ECT/IAT readings look plausible.
• Check connectors and wiring under the bonnet and front bumper for corrosion, damage, or loose clips.
• Maintain the cooling system—fresh Honda Type 2 coolant and a proper bleed prevent false readings and sensor fouling.

Signs a temp sensor is playing up include hard cold starts, the radiator fans running constantly, a wandering temperature gauge, poor fuel economy, or harsh/odd shifts on autos. Common fault codes include ECT circuit issues (P0117/P0118) or thermostat performance (P0128). If readings are off compared with ambient when stone cold, the sensor may be due.

Replacing an ECT sensor is a straightforward job for a trained tech: let the engine cool, relieve system pressure, drain a little coolant, unplug the connector, swap the sensor and sealing washer, then refill and bleed to factory procedure. Avoid overtightening, and always use the correct coolant. For IATs in the intake duct, gentle cleaning with appropriate sensor-safe spray can help—never touch the sensing element. Ambient sensors sit near the front bumper and can be knocked in minor scrapes, so a quick visual during services is worthwhile.

Popular questions

Where is the coolant temperature sensor on a 2017 Honda Accord?

It’s typically threaded into the engine’s coolant passage near the thermostat housing or on the cylinder head. Exact spot varies by engine (2.4L vs 3.5L), but it’s accessible under the bonnet with the right tools. A workshop manual or qualified technician can pinpoint it quickly.

Can you drive a 2017 Accord with a bad temperature sensor?

It may run, but it’s not wise. A faulty ECT can cause rich running, poor economy, cooling fan issues, and even engine damage if overheating goes unnoticed. If the transmission temp sensor is off, shift quality and gearbox protection suffer. Get it diagnosed and repaired promptly.

Do temperature sensors need regular replacement?

No set interval—replace on condition. During routine services, check scan data and wiring, and keep coolant fresh. Many sensors last the life of the vehicle, they’re only swapped if readings are out of spec, there’s damage, or fault codes point to a failure.