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Blink Code 9

Honda Motorcycle

Severity: Minor

Source: OnlyErrorCodes.com — Every error code. One place.

Honda Motorcycle Blink Code 9 — Air Temp Sensor

What it means

Blink code 9 on a Honda motorcycle means the intake air temperature sensor circuit has an open or short.
The ECU defaults to a fixed value and the bike runs with slightly reduced throttle response.
Sensor replacement is straightforward and inexpensive.

Affected Models

  • Honda CBR1000RR
  • Honda CBR600RR
  • Honda CB650R
  • Honda CB500X
  • Honda Africa Twin

Common Causes

  • Failed IAT sensor (NTC thermistor)
  • Loose or corroded sensor connector
  • Wiring damage between sensor and ECU
  • Aftermarket air filter or airbox bypassing the sensor
  • Damaged sensor pins from rough handling

How to Fix It

  1. Locate the IAT sensor.

    The IAT sensor is mounted in the airbox or intake duct.
    It is typically a small two-pin sensor with the tip exposed to incoming air.

  2. Inspect the connector.

    Disconnect and look for corrosion or moisture.
    Clean with electrical contact cleaner and apply dielectric grease before reconnecting.

  3. Test sensor resistance.

    Disconnect and measure across the sensor pins.
    NTC sensors read 2,000–3,000 ohms at 20°C dropping as temperature rises.
    Out-of-range readings confirm the sensor.

  4. Test wiring continuity.

    Use a multimeter to test continuity from sensor connector to ECU.
    An open wire produces the same blink as a failed sensor.

  5. Replace the sensor if testing confirms failure.

    Honda IAT sensors cost USD 25–55.
    Replacement is a single screw or push-in fitting — 10 minutes including connector reseating.

Frequently Asked Questions

Will blink code 9 affect my Honda's performance noticeably?

Slightly.
The ECU uses a default temperature value when the sensor fails, which is reasonable for moderate weather.
Cold-start fuel mixing may be slightly off in winter; fuel economy may drop a few percent.
Many riders only notice after fixing the sensor.

Why does blink code 9 keep coming back?

Repeated blink 9 usually traces to connector moisture or corrosion rather than the sensor itself.
After fixing the immediate fault, apply dielectric grease to the connector to prevent recurrence.