Parts for your 2017 Honda Cr-v-Temperature sensors

2017 Honda CR‑V temperature sensors: what they do and when to service them

Temperature sensors are absolutely fitted to the 2017 Honda CR‑V and they’re central to how the vehicle runs. Honda’s 2017 CR‑V service information and wiring diagrams specify multiple sensors, including engine coolant temperature (ECT), intake air temperature (IAT), transmission/CVT fluid temperature, ambient/outside air, and A/C evaporator and cabin thermistors. Honda ServiceNews bulletins for Earth Dreams engines also note dual ECT logic on many 1.5‑litre turbo variants, and standard OBD‑II fault families (P0115–P0119, P0128, P0071–P0073) apply to these circuits, confirming their presence and role.

What do they actually do? In short, they help the CR‑V think clearly. The ECT sensor tells the ECU how warm the engine is so it can set fuelling and ignition, switch the radiator fans, protect the turbo, and manage warm‑up to save fuel. The IAT sensor ensures the right air‑fuel mix as weather swings from a frosty Dunedin morning to a scorching Perth arvo. The CVT fluid temperature sensor safeguards shift quality and longevity. Ambient and evaporator sensors let the climate control keep the cabin comfy without fogging or freezing the evaporator.

There’s no fixed replacement interval for temperature sensors, they’re serviced on condition. During routine 12‑month/20,000‑km servicing, a technician should:

• Scan live data from ECT, IAT and CVT temp at cold start to verify they track ambient.
• Inspect connectors and looms near the thermostat housing, radiator outlet, airbox/snorkel, front grille and A/C lines for corrosion, damage or rub‑through.
• Maintain fresh coolant (Honda Type 2) to minimise sensor fouling and sealing issues.

Tell‑tale signs a temp sensor’s on the fritz include a hard cold start, rich smell, poor economy, fans running flat‑out, erratic temperature gauge, A/C that cycles oddly, CVT going into a protective mode, or a check‑engine lamp with temperature‑related DTCs.

Replacement is straightforward with the right steps: work on a cold engine, depressurise the cooling system, swap the sensor and O‑ring, torque to the workshop spec, then refill and bleed coolant. For IAT, it’s typically a quick remove‑and‑refit at the airbox. Ambient sensors sit near the grille and can be vulnerable to stone damage. After any replacement, clear codes and confirm readings with a scan tool, some models may require an idle relearn.

Technical references: Honda CR‑V (2017) Service Manual – Engine Cooling, PGM‑FI, HVAC and CVT sections, Honda ServiceNews (Earth Dreams ECT/IAT diagnostics), OBD‑II/SAE J1979 temperature PID diagnostics.

Popular questions about 2017 Honda CR‑V temperature sensors

Does the 2017 Honda CR‑V have more than one coolant temperature sensor?
Many 2017 CR‑V variants, especially the 1.5‑litre turbo, use two ECT sensors: one at the engine and another at the radiator outlet. The ECU compares both to manage warm‑up, fans and fail‑safe strategies. A mismatch can trigger a fault code and odd fan behaviour.

How often should temperature sensors be replaced?
There’s no scheduled interval. Replace only when diagnostics show a fault or readings are implausible. Regular servicing, clean connectors and fresh coolant help them last the life of the vehicle.

Can a faulty temp sensor cause high fuel use or rough running?
Yes. If the ECU thinks the engine is colder than it is, it enriches the mix, bumping fuel use and carbon build‑up. Cold‑start flare, hunting idle and strong fuel smell are common clues.