Parts for your 2011 Honda Stream-Temperature sensors

2011 Honda Stream temperature sensors — purpose, servicing and when to replace

Temperature sensors are absolutely fitted to and relevant on the 2011 Honda Stream. Technical sources such as the Honda Stream RN6–RN9 Service Manual (2010–2012), Honda PGM-FI system descriptions, the Automatic Transmission section, and the HVAC diagnostic manual all detail multiple temperature sensors: the engine coolant temperature (ECT) sensor, intake air temperature (IAT) sensor, automatic transmission fluid (ATF) temperature sensor on auto models, and ambient/evaporator sensors for climate control. These are core inputs the ECU and climate modules rely on for proper operation.

On this model’s R18A 1.8-litre or R20A 2.0-litre i-VTEC engines, the ECT sensor tracks coolant temperature so the ECU can manage cold-start enrichment, ignition timing, idle speed, radiator fan operation, and overheat protection. The IAT sensor helps trim fuelling for changing air density. Auto variants use an ATF temperature sensor to refine shift timing and torque-converter lock-up. Cabin comfort is kept in check by ambient and evaporator sensors that cue the climate control for stable temps and demisting. In short, these little senders keep the Stream starting cleanly, running efficiently, and shifting and cooling the way it should.

As part of routine servicing, a workshop will usually scan live data to confirm the ECT and IAT track sensibly from cold to operating temperature (roughly mid-80s to low-90s °C once warm), check for stored fault codes, and inspect connectors for corrosion or broken terminals. There’s no fixed replacement interval, sensors are replaced on condition. If the ECT fails or reads implausibly, expect poor economy, a rich smell, lazy performance, or a radiator fan that runs at odd times. Replacement is straightforward: let the engine cool, relieve pressure, unplug the connector, swap the sensor (with the correct sealing washer), then refill and bleed Honda Type 2 coolant and verify for leaks. For IAT (often integrated with the intake duct or MAP/MAF assembly depending on engine), cleaning electrical pins and ensuring a tight air duct often solves flaky readings.

• Common symptoms: hard cold starts, rough idle, high fuel use, temperature gauge misbehaviour, fans running constantly, DTCs like P0115–P0119.
• Service tip: verify thermostat operation alongside ECT checks, a stuck thermostat can mimic a lazy sensor.
• Use OEM-equivalent sensors and follow the service manual torque spec.
• After any cooling-system work, bleed air to prevent hot spots.

Where is the coolant temperature sensor on a 2011 Honda Stream?

On RN6–RN9 models it’s typically threaded into the cylinder head or near the thermostat/water outlet housing, with a two-pin connector. Access is usually from the top or front of the engine bay. Exact position can vary slightly between R18A and R20A engines, so checking the service manual by VIN is the tidy way to confirm before ordering parts.

Is it safe to drive with a bad temperature sensor?

Not recommended. A faulty ECT can cause rich running, poor economy, and radiator fan or A/C behaviour that’s not ideal. In the worst case, it can mask genuine overheating, risking head gasket damage. If the gauge or scan data looks wrong, it’s best to diagnose promptly and avoid long drives until it’s sorted.

What does replacement usually cost in Australia or New Zealand?

For an ECT sensor, parts typically range from about AUD/NZD $40–$120 depending on brand. Labour is around 0.5–1.0 hour, plus coolant top-up or a partial change. Shops may bundle sensor replacement with a scheduled coolant service to save a bit on fluid and labour overlap.