Parts for your 2005 Honda Fit-Throttle position sensors

2005 Honda Fit throttle position sensors (TPS): what they do and how to look after them

Based on Honda’s technical literature for the GD-series Jazz/Fit (2002–2008) and the Honda Electronic Parts Catalogue, the 2005 Honda Fit uses an electronic throttle body (ETC) that contains dual throttle position sensors (often called TPS A/B) built into the unit. The factory service manual details diagnostics for TPS-related DTCs such as P0121–P0123, P0221–P0223 and P2135, confirming the TPS is present and monitored. On this model, the TPS isn’t typically sold as a separate piece, if it fails, the usual repair is replacing the throttle body assembly.

On a 2005 Fit, the TPS tells the engine control module exactly how far the throttle plate is open. That lets the ECM match fuel and spark to driver demand, keep idle smooth, and manage cruise and traction features. Because it’s a drive-by-wire setup, there are two TPS tracks for redundancy and a separate pair of accelerator pedal position sensors under the dash. If the signals don’t agree, the car can go into limp mode to protect itself.

As part of routine servicing, it’s smart to:

• Scan for fault codes and check live data (throttle angle and correlation) if there’s a check engine light, sluggish take-off, hunting idle or sudden drops in power.
• Clean the throttle body bore and plate with appropriate cleaner when there’s sticky throttle response or after high-kilometre use. Don’t flood the electronics, keep solvents away from the actuator and sensor housings.
• Perform an idle/throttle learn after cleaning, battery disconnect or throttle body replacement. On these Hondas that usually means warming the engine fully, then letting it idle with all loads off for several minutes so the ECM relearns the target position. A scan tool can speed this up.

If a TPS fault returns after cleaning and a relearn, odds are the integrated sensor has worn. Replacement involves swapping the throttle body assembly, fitting a new gasket, torquing the bolts correctly, reconnecting the harness, then carrying out the idle learn and clearing codes. Because the TPS is part of the electronic module, there’s no adjustment like the old cable-throttle days—if it’s out of spec, replacement is the fix. Using quality parts and keeping the throttle clean helps the Fit run crisply and keeps fuel economy on point around Aussie and Kiwi city traffic.

Popular questions about 2005 Honda Fit throttle position sensors

Does a 2005 Honda Fit actually have a TPS?
Yes. The 2005 Fit’s electronic throttle body contains dual throttle position sensors. Honda’s GD-series service manual lists TPS-related diagnostics, and the parts catalogue shows the TPS integrated with the throttle body rather than as a separate bolt-on sensor.

What are the common signs the TPS is playing up?
Drivers may notice a check engine light, hesitant or flat acceleration, erratic idle, sudden loss of power or limp mode. Scan results often show DTCs like P0122, P0222 or P2135, and live data may reveal mismatched sensor tracks.

Can it be fixed without replacing the whole throttle body?
Sometimes a careful throttle body clean and an idle/throttle relearn will restore smooth operation, especially if the plate was sticking. If correlation or range codes persist, the integrated TPS is likely worn, and replacing the complete throttle body is the reliable repair.