ARCO TP001 Throttle Position Sensor | MerCruiser, Volvo Penta & OMC
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
Restore precise throttle response and fuel management to your inboard engine with this OEM-grade replacement throttle position sensor from ARCO. The throttle position sensor (TPS) is a critical input for your engine’s electronic control module — it tells the ECM exactly where the throttle plate is at any given moment, enabling accurate fuel delivery, smooth acceleration, and proper idle control. When it fails, you’ll typically see rough idle, hesitation, erratic RPM, or a check engine condition.
ARCO’s TP001 is engineered as a direct OEM replacement for GM 5.7L and 6.2L MPI inboard engines used across MerCruiser, Volvo Penta, and OMC Stern Drive applications from 1997 onward. It installs in the factory location with no modification required.
- Direct OEM replacement — plug-and-play installation, no modification required
- Restores accurate throttle position signaling to the engine control module
- Resolves rough idle, hesitation, erratic RPM, and throttle-related fault codes
- Fits GM 5.7L and 6.2L MPI inboard engines (1997 and up)
- Compatible with MerCruiser, Volvo Penta, and OMC Stern Drive applications
Fitment & Cross-Reference
- Fits: GM 5.7L, 6.2L MPI — 1997 and up
- Replaces MerCruiser: 803148
- Replaces OMC Stern Drive / Volvo Penta: 3855296
- Replaces Sierra: 18-7757
- Replaces CDI Electronics: E13-0008
Parts Desk Insights
Best Use Case: This is the correct replacement when diagnosing throttle-related driveability issues on GM-based MPI inboard engines — specifically rough or unstable idle, flat spots during acceleration, or an engine that hunts for RPM at cruise. Before replacing, confirm the fault with a scan tool showing TPS voltage out of range or erratic signal. The TP001 is a straightforward swap: disconnect the harness, remove two screws, install the new sensor, and set the throttle plate to closed before tightening. No special tools required. If symptoms persist after replacement, inspect the throttle body bore and plate for carbon buildup, which can cause similar symptoms.
Part Number: TP001
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.