Polaris Error Code 173 3 - Your Complete DIY Diagnostic & Fix Guide

You’re deep on the trail, kicking up mud, and loving every second of it. Suddenly, that dreaded check engine light flashes on your Polaris dash, and your machine sputters into limp mode. You scroll through the display and see it: polaris error code 173 3. Your perfect day just hit a major roadblock.

We’ve all been there. A cryptic code can kill the fun and fill your head with worries about expensive shop bills and complicated repairs. But what if we told you this is one code you can likely tackle yourself with the right guidance?

At FatBoysOffroad, we believe in empowering riders like you. This comprehensive guide will demystify error code 173 3, walk you through a step-by-step diagnostic process, and show you exactly how to fix it. Get ready to trade that frustration for the satisfaction of a job well done and get back to what you love—riding.

What Exactly is Polaris Error Code 173 3? Decoding the Dash Light

When your Polaris throws a code, it’s speaking a specific language. Let’s translate this one into plain English.

The official definition for polaris error code 173 3 is: Exhaust Gas Temperature Sensor – Voltage Too Low (Grounded Circuit). In simpler terms, the sensor that measures how hot your exhaust is (the EGT sensor) is sending a signal to your machine’s brain (the ECU) that is abnormally low or seems to be shorted to ground.

Your ECU relies on this temperature data to manage fuel delivery and engine performance. When it gets a faulty reading, it can’t trust the information. As a safety measure, it often triggers “limp mode,” drastically cutting power to protect your engine from potential damage.

Why Ignoring This Code is a Bad Idea: The Real-World Impact

It can be tempting to clear the code and hope it goes away, but that’s a risky gamble. The benefits of properly addressing polaris error code 173 3 are significant, both for your machine and your wallet.

Ignoring it means you’ll likely be stuck with:

Crippling Limp Mode: Your top speed and acceleration will be severely limited, making it impossible to tackle challenging terrain and turning your ride home into a frustrating crawl.
Poor Fuel Economy: Without accurate temperature data, the ECU might enrich the fuel mixture, causing your machine to burn through gas much faster than usual.
Potential Engine Damage: An incorrect exhaust reading can lead to an improper air-fuel ratio over time, which could potentially harm internal engine components.
Failed Emissions: A properly functioning exhaust system is crucial for keeping emissions in check. Fixing the issue is an eco-friendly polaris error code 173 3 solution that ensures your machine runs as cleanly as designed. A well-maintained machine is a more sustainable machine in the long run.

Common Problems and Culprits Behind Error Code 173 3

Before you start throwing parts at the problem, it’s crucial to understand the most likely culprits. More often than not, the issue is simpler than you think. Here are the most common problems with polaris error code 173 3.

1. Damaged Wiring or Connectors

This is, by far, the most common cause. The EGT sensor’s wiring harness lives in a harsh environment, constantly exposed to extreme heat, vibration, water, and mud. Wires can easily get melted, chafed against the frame, or corroded at the connection point.

2. A Faulty EGT Sensor

Like any electronic component, the Exhaust Gas Temperature (EGT) sensor itself can fail. Over time, the intense heat cycles can cause the internal components to break down, leading to inaccurate readings or a complete failure that triggers the code.

3. A Faulty ECU (The Rare Case)

While possible, a problem with the Engine Control Unit (ECU) is highly unlikely to be the cause. Always exhaust every other possibility—wiring and sensor—before even considering the ECU. This should be your absolute last resort.

Your Step-by-Step Polaris Error Code 173 3 Guide to Diagnosis

Alright, let’s get our hands dirty. This diagnostic process will help you pinpoint the exact cause. Following this polaris error code 173 3 guide is your best path to an accurate fix.

Safety First: Pre-Check Essentials

Before you start, safety is paramount. The exhaust system gets incredibly hot.

Let It Cool Down: Make sure the engine and exhaust are completely cool to the touch.
Disconnect the Battery: Disconnect the negative battery terminal to prevent any accidental electrical shorts.
Gather Your Tools: You’ll likely need a basic socket set, wrenches, a flashlight or headlamp, and possibly a multimeter.

Step 1: Locate the EGT Sensor

The EGT sensor is a small probe that screws directly into your exhaust pipe, usually before the muffler. It will have a wire coming off it that leads to a connector. Follow the exhaust manifold back from the engine, and you’ll find it.

Step 2: The Visual Inspection (Your Most Powerful Tool)

This is where most issues are found. Take your time and be thorough. Here are some key polaris error code 173 3 tips for your inspection:

Follow the wire from the sensor all the way back to its main connector. Look for any signs of damage:

Melted Spots: Has the wire touched the hot exhaust pipe?
Chafing: Is the wire rubbing against the frame or another component, wearing through the insulation?
Pinched Wires: Could the wire have been crushed during a previous repair or by a zip tie that’s too tight?
Corrosion: Check for any green or white crusty buildup, especially at the connector.

Step 3: Checking the Connector

Carefully unplug the EGT sensor’s electrical connector. Shine a light inside both the male and female ends. You’re looking for dirt, mud, water, or any bent or broken pins. A poor connection here is a very common cause of a “grounded circuit” code.

Step 4: Testing with a Multimeter (For the Advanced DIYer)

If the visual inspection reveals nothing, you can use a digital multimeter to test the circuit. Set it to measure resistance (Ohms Ω). Unplug the sensor and test the sensor itself—a healthy sensor should have a specific resistance value (consult your service manual). More importantly, check the wiring harness side. Test for continuity between the signal wire and a good frame ground. If you have continuity, you’ve confirmed a short circuit somewhere in the harness.

Fixing the Problem: From Simple Repairs to Sensor Replacement

Once you’ve diagnosed the issue, the fix is usually straightforward. Here’s how to polaris error code 173 3 repair the most common failures.

Option 1: Repairing Damaged Wires

If you found a broken or chafed wire, don’t just twist it together and wrap it in electrical tape. For a lasting repair, use heat-shrink butt connectors. They create a strong, weatherproof seal that can withstand the harsh off-road environment. Ensure you route the repaired wire away from any heat sources or sharp edges, using zip ties to secure it safely.

Option 2: Replacing the EGT Sensor

If the sensor itself is bad, replacement is the only option. Start by spraying the threads where the old sensor screws into the exhaust with a good penetrating oil and let it soak.

Use the correct size wrench to carefully unscrew the old sensor.
Apply a small amount of high-temp anti-seize compound to the threads of the new sensor. This will make future removal much easier.
Thread the new sensor in by hand to avoid cross-threading, then tighten it to the manufacturer’s specified torque.
Plug in the new connector, applying a small amount of dielectric grease to keep moisture out.

Step 3: Clearing the Code

After completing your repair, reconnect the battery. On most Polaris models, the code will clear itself after a few successful start-and-run cycles. You can also typically clear it by leaving the battery disconnected for about 15-20 minutes.

Prevention and Best Practices: A Long-Term Care Guide

Fixing the problem is great, but preventing it from happening again is even better. This polaris error code 173 3 care guide focuses on simple, preventative maintenance.

Adopting these polaris error code 173 3 best practices will save you headaches down the road:

Secure Your Wiring: After any maintenance, double-check that all wiring harnesses are properly secured in their clips and routed away from the hot exhaust and moving parts.
Use Dielectric Grease: Apply a small amount of dielectric grease to key electrical connectors during routine maintenance to prevent corrosion and keep water out.
Clean Your Machine: Regularly washing mud and debris from the engine bay and undercarriage doesn’t just make your ride look good; it allows you to spot potential issues like a loose or rubbing wire before it becomes a problem.

Frequently Asked Questions About Polaris Error Code 173 3

Can I still ride my Polaris with error code 173 3?

It’s strongly advised not to. The code usually puts your machine in limp mode for a reason—to protect the engine. Continuing to ride could mask a more serious issue and potentially lead to costly damage. It’s best to diagnose and fix it before your next adventure.

How much does it cost to fix error code 173 3?

The cost varies widely. If it’s a simple wire repair you do yourself, the cost is minimal—just your time and a few cents for a connector. If you need a new EGT sensor, the part can range from $50 to over $150, depending on your model. A shop repair will add labor costs on top of that.

Is the EGT sensor the same on all Polaris models?

No, they are often specific to certain engine sizes, years, and models. Always use your machine’s VIN or specific model information to order the exact replacement part to ensure proper function.

Could an aftermarket exhaust cause this code?

Absolutely. If an aftermarket exhaust relocates the EGT sensor to a spot with a different temperature profile, or if the sensor was damaged or its wiring was stressed during installation, it can easily trigger this code. Always be meticulous when installing performance mods.

Tackling an error code can feel intimidating, but with a clear, logical approach, you can solve polaris error code 173 3 right in your own garage. By following the steps to inspect the wiring, check the connector, and test the components, you’re taking control of your machine’s health. You’re not just fixing a problem; you’re building skills and confidence.

Now you have the expert knowledge to get this sorted out. Get those tools ready, be patient with your diagnosis, and you’ll be back on the trail in no time. Ride smart, ride safe, and we’ll see you out there!

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Thomas Corle

Founder & Automobile expert at FatBoysOffroad

Automobile expert and off-road enthusiast, sharing in-depth knowledge of vehicles, gear, and adventures. Helping readers make smart decisions and enjoy the thrill of off-roading safely and confidently.