Parts for your 2002 Honda Stream-Temperature sensors

2002 Honda Stream temperature sensors

Based on technical sources — including the Honda Stream (RN1–RN5) Service Manual for 2001–2005, the 2002 Honda Stream Electrical Troubleshooting Manual, and NGK/NTK and Denso sensor catalogues — temperature sensors are absolutely fitted to the 2002 Honda Stream and are central to how it runs. These include the engine coolant temperature (ECT) sensor, the intake air temperature (IAT) sensor, and, on automatic models, an automatic transmission fluid (ATF) temperature sensor. Climate control variants may also use an ambient/evaporator temperature sensor for the HVAC system.

On this model, temperature sensors tell the ECU how warm the engine, intake air, and (where applicable) the transmission fluid are, so fueling, ignition timing, idle speed, VTEC engagement (on K-series), and shift strategy all behave as they should from a cold start through to a long motorway run. If the ECT sensor lies, the engine can run rich as a cold morning, fans may not cut in when needed, and fuel economy and emissions can go pear-shaped. Likewise, the IAT helps fine-tune mixture as air density changes, and the ATF temp sensor protects the auto by managing shift feel and line pressure as the fluid heats up.

As part of routine servicing on a 2002 Honda Stream, temperature sensors don’t have a fixed replacement interval, but they’re worth a check whenever there are hard starts, high idle, poor fuel economy, overheating complaints, or a cooling fan that runs constantly. A scan tool that shows live data will quickly reveal whether the ECT and IAT readings match reality (cold engine near ambient, smooth warm-up to about 80–95°C). Any stored OBD-II faults (e.g., P0115–P0119 for ECT, P0110–P0114 for IAT) are a clue to investigate wiring, connectors, grounds, and the sensor itself.

• Replacement tips: Always work on a stone-cold engine, relieve cooling system pressure, and catch coolant cleanly.
• ECT sensor: Typically threaded in the thermostat housing/head area. Renew the sealing washer/O-ring, torque to the Honda spec (around 18 N·m — confirm in the manual), and refill/bleed with Honda Type 2 coolant.
• IAT sensor: Usually in the intake duct or airbox. Inspect for oil contamination, clean the connector and ensure a snug fit to prevent false readings.
• ATF temp sensor (autos): Diagnosed via scan data and resistance checks, if codes persist, confirm loom integrity before replacing.

Genuine or reputable OEM-equivalent sensors are recommended. A quick health check of readings at every major service, under-bonnet connector cleaning, and correct coolant/ATF maintenance will keep these little thermistors doing their job and the Stream behaving as it should across Aussie and Kiwi conditions.

Popular questions

Where is the engine coolant temperature sensor on a 2002 Honda Stream?
On most 2002 Streams, the ECT sensor sits near the thermostat housing on the cylinder head, facing the front of the engine. It’s a small two-pin sensor threaded into a coolant passage. Access varies slightly between the D17 1.7-litre and K20 2.0-litre engines, removing the intake ducting gives clearer room to work.

Look for the sensor with a plastic connector and a single hex body. If in doubt, follow the upper radiator hose to the housing — the sensor is typically nearby.

What are the symptoms of a failing temperature sensor on this model?
Common giveaways include hard cold starts, rough idle, poor fuel use, black tailpipe soot, cooling fans running all the time or not at all, and an erratic temperature gauge. The check engine light may flag codes relating to ECT or IAT performance or circuit range.

Live data that never moves from a fixed value (e.g., stuck at -40°C or 130°C) is a classic sign. Wiring faults and corroded connectors can mimic a bad sensor, so testing both resistance and harness integrity is wise.

Does the ECU need resetting after replacing an ECT or IAT sensor?
Not usually, but it helps to clear any stored codes and perform an idle relearn so the ECU trims settle. On Honda ECUs of this era, a battery disconnect or scan-tool reset followed by a proper warm-up drive cycle lets fuel trims and fan control relearn cleanly.

Make sure coolant is fully bled (for ECT work) and there are no intake leaks (for IAT work), otherwise the ECU will adapt around a fault and you’ll chase your tail.