Parts for your 2009 Honda Stream-Throttle position sensors

2009 Honda Stream throttle position sensor (TPS)

Yes, the 2009 Honda Stream uses a throttle position sensor. Technical sources including the Honda Stream RN6–RN9 Service Manual (Electronic Throttle Control System section), Honda EPC/parts catalogues for the RN-series Stream, and the Honda Civic R18A/R20A workshop manual confirm the TPS is integrated into the electronic throttle body on these engines. It isn’t listed as a separate, serviceable part, if the TPS fails, the complete throttle body assembly is replaced.

On the 2009 Stream’s R18A or R20A SOHC i-VTEC engines, the TPS tracks the exact angle of the throttle plate and feeds that signal to the ECU. Paired with the accelerator pedal position sensor, it lets the ECU command smooth drive-by-wire response, stable idle, and correct fuel and ignition timing. When the TPS signal is off, owners may notice erratic idle, surging, dead spots on acceleration, poor fuel economy, or the MIL on with codes like P0121–P0123 or P2135.

Because Honda integrates the TPS into the throttle body on this model, replacement generally means swapping the throttle body assembly. A genuine or quality OEM-equivalent unit is recommended. After fitting, an idle learn/throttle position learn needs doing: warm the engine to operating temp, turn all loads off (A/C, lights, fans), then let it idle undisturbed for about 5 minutes. Some workshops use a scan tool to run the throttle/idle relearn as well.

• Symptoms worth checking: hesitant take-off, unpredictable throttle response, hunting idle, and throttle-related DTCs.
• Service tips: clean the throttle bore and plate periodically using throttle-body-safe cleaner. Avoid soaking the sensor area. Replace the gasket if the throttle body is removed.

Routine maintenance focuses on keeping the throttle body clean and ensuring all grounds and connectors are tidy and corrosion-free. If faults persist after cleaning, professional diagnosis with live data will confirm whether the TPS signal is unstable. Given the sensor is not separately serviceable on the Stream, budgeting for a full throttle body replacement (plus a new gasket and fresh coolant top-up if hoses are disturbed) is the sensible play. A careful install, correct torque on fasteners, and a proper idle learn procedure will have the Stream running sweetly again for many more kilometres.

• When to replace: if DTCs return after cleaning and there’s clear TPS signal dropout on a scan tool, or the ECU logs correlation faults between pedal and throttle sensors.
• Good workshop practice: battery support during relearn, smoke-test for intake leaks, and confirm stable idle speed once warm.

Popular questions about 2009 Honda Stream throttle position sensors

Is the TPS on a 2009 Stream replaceable by itself?
On the RN6–RN9 Stream, the TPS is built into the electronic throttle body and isn’t listed as a separate service part. If it’s faulty, the usual repair is to replace the complete throttle body assembly and carry out an idle/throttle learn.

What are common signs the TPS is playing up?
Drivers often report surging, flat spots on acceleration, or a hunting idle. The check engine light may appear with codes such as P0121–P0123 or P2135. A scan tool will show erratic throttle angle readings compared with pedal input if the TPS is failing.

Does the Stream need calibration after throttle body work?
Yes. After cleaning or replacing the throttle body, perform an idle learn so the ECU can relearn the throttle plate position. Warm the engine fully, turn all loads off, and let it idle for about 5 minutes. Some workshops also run the throttle learn via a scan tool for best results.