Parts for your 2019 Honda Cr-v-Temperature sensors

2019 Honda CR‑V temperature-sensors: what they do and how to look after them

Temperature-sensors are absolutely fitted to the 2019 Honda CR‑V. Honda’s 2019 CR‑V Service Manual and Honda Service Information confirm multiple factory sensors: engine coolant temperature (ECT), intake air temperature (IAT), ambient air temperature (for climate control and the dash display), evaporator temperature (HVAC) and, on CVT models, transmission fluid temperature. These sensors feed the powertrain control module and HVAC controls, and they’re essential for drivability, efficiency and occupant comfort.

In day‑to‑day use, the ECT sensor is the star player. Under the bonnet it tells the engine computer how warm the engine is, so fuelling, ignition timing and idle speed are spot‑on from cold start to highway cruise. It also helps command the radiator fans to prevent overheating. The IAT sensor helps with crisp throttle response and fuel economy by correcting for air density, while the ambient and evaporator sensors keep the cabin comfy and stop the air‑con evaporator icing up. On CVT models, transmission fluid temperature helps protect the transmission by managing line pressure and shift strategy.

There’s no scheduled replacement interval for these temperature-sensors, they’re serviced “as required”. During routine maintenance, a technician will typically scan live data to make sure temperatures read plausibly (Honda SIS/Service Manual procedure). If values are out of whack, fault codes like P0117/P0118 (ECT), P0113 (IAT) or P0073 (ambient) often appear.

• Hard cold starts, rough idle or high fuel use
• Cooling fans running constantly or not at all
• Erratic temperature gauge or A/C performance
• Check Engine light and stored temperature‑related codes

Replacement is straightforward with the right approach. Let the engine cool completely. For an ECT sensor, drain a little coolant, unplug the connector, swap the sensor and O‑ring, then refill and bleed the cooling system. Always tighten to the specification in the Honda workshop manual and use genuine‑grade coolant (Honda Type 2 blue). An IAT or ambient sensor usually unplugs and unclips, the evaporator sensor sits within the HVAC case and may take more trim time. After any work, verify readings with a scan tool and check for leaks.

Good habits go a long way: keep connectors clean and undamaged, fix any coolant leaks promptly, and stick to the coolant change interval (Honda Type 2 is typically up to 10 years/200,000 kilometres initially, then 5 years/100,000 kilometres). That way, the CR‑V’s temperature-sensors keep doing their quiet, clever job without fuss.

How can someone tell if a temperature-sensor is failing on a 2019 CR‑V?

Common giveaways include a Check Engine light, poor cold‑start manners, high fuel use, or radiator fans behaving oddly. A quick scan of live data will show if a sensor is stuck at an implausible value (for example, reading sub‑zero on a warm day). Comparing scan‑tool temperature to actual ambient and to an infrared thermometer is a handy cross‑check.

Do temperature-sensors need routine replacement?

No. Honda doesn’t list a routine interval. They’re replaced if faulty, contaminated, physically damaged or corroded. During coolant services, it’s smart to inspect the ECT sensor and connector, ensure the O‑ring isn’t weeping, and confirm readings are sensible with a scan tool.

Is it safe to drive with a bad ECT sensor?

It may run, but it’s not a great idea. The engine computer can default to a backup value, which can mean rich mixtures, poor economy, and cooling fans that cycle at the wrong time. There’s also a higher risk of overheating. It’s best to address it promptly to protect the engine and keep the CR‑V running sweetly.