Multiquip 43140-17 Exhaust O2 Sensor

The Multiquip 43140-17 Exhaust O2 Sensor is a genuine OEM component designed for STXDF super-sized hydrostatic ride-on power trowels. Sourced directly through Multiquip's OEM supply chain, this sensor delivers the exact fit and electrical specification required to maintain proper engine management on dual-fuel STXDF machines. If you're servicing or restoring an STXDF unit, replacing this sensor with the correct OEM part ensures the engine control system receives accurate exhaust data.

Key Features

• Genuine OEM Accuracy — Matched to the exact output signal range required by the STXDF engine management system, not a generic universal-fit substitute.
• Dual-Fuel System Compatible — Engineered to function correctly across both propane and gasoline operating modes on STXDF dual-fuel trowels.
• Direct Connector Match — Plug-and-play fitment into the existing exhaust sensor port with no wiring modification needed.
• Protects Engine Efficiency — A functioning O2 sensor keeps the air/fuel mixture in the correct range; a failed sensor can cause rich running, increased fuel consumption, and loss of trowel power output.
• Emissions System Integrity — Correct sensor output is essential for exhaust emissions compliance on STXDF trowels operating under applicable engine tier standards.

An exhaust O2 sensor measures the oxygen content in the engine's exhaust stream and sends a continuous signal to the engine control unit, which uses that data to fine-tune the air/fuel mixture in real time. On a dual-fuel machine like the STXDF, this feedback loop is especially important because fuel characteristics differ between propane and gasoline, and the ECU relies on accurate O2 readings to compensate. When the sensor fails or delivers a degraded signal, the engine may run inefficiently, fuel consumption rises, and the machine may exhibit rough idle, reduced blade torque, or trigger a fault condition.

DHS Equipment is an authorized Multiquip parts distributor. For fitment questions or help confirming compatibility with your specific STXDF serial number, contact our parts team directly.

Part Details

Compatibility & Fitment

Verify Before You Order

Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.

Why Buy From DHS Equipment

Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.

Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.