There’s nothing that kills the thrill of a perfect powder day faster than a flashing check engine light. You glance down at your gauge cluster, and that dreaded polaris axys code 173 is staring back at you, putting your sled into a frustrating limp mode. Your heart sinks, and you immediately start thinking about a ruined trip and an expensive repair bill.
But hold on a second. Take a deep breath.
We’re here to promise you that this code isn’t always a catastrophe. In fact, more often than not, it’s a problem you can diagnose and fix yourself with basic tools, whether you’re back in the garage or need to make a trailside repair. This is the ultimate polaris axys code 173 guide for the DIYer.
In this article, we’ll break down exactly what this code means, the common symptoms to watch for, and a step-by-step process to find and fix the root cause. We’ll cover the tools you need, the pitfalls to avoid, and how to keep this issue from happening again. Let’s get your machine back to full power.
What Exactly is Polaris AXYS Code 173? Decoding the Warning
When your Polaris display shows a fault code, it’s speaking a specific language. Think of it as the machine telling you precisely where it hurts. The polaris axys code 173 specifically points to a problem with the Exhaust Gas Temperature (EGT) sensor circuit.
Your sled’s computer, the Engine Control Unit (ECU), relies on this sensor to measure the heat of the exhaust gases leaving your engine. This data is critical for the ECU to make real-time adjustments to the fuel mixture, ensuring optimal performance and protecting the engine from running too lean (hot) or too rich (cool).
The code usually appears with a second number, called the FMI (Failure Mode Identifier):
- SPN 173, FMI 3: This means the ECU is seeing a voltage from the sensor that is too high, often caused by a short to power or a broken wire creating an open circuit.
- SPN 173, FMI 4: This means the ECU is seeing a voltage that is too low, typically from a wire that has shorted to ground.
In simple terms, the communication line between the EGT sensor and the sled’s brain has been disrupted. The ECU can’t get a reliable temperature reading, so it plays it safe by triggering the check engine light and cutting power (limp mode) to prevent potential engine damage.
Common Symptoms: How Your Sled Tells You Something’s Wrong
Besides the code itself, your sled will give you a few other signals that something is amiss. Recognizing these symptoms can help confirm you’re on the right track. The most common problems with polaris axys code 173 often manifest in your machine’s performance.
Here’s what you’ll likely experience:
- Check Engine Light (CEL): This is the most obvious indicator. The moment the ECU detects the fault, it will illuminate the warning light on your dash.
- Limp Mode: To protect your engine, the ECU will drastically reduce power. You’ll notice the sled feels sluggish and won’t rev out like it should. This is the ECU’s self-preservation mode.
- Poor Fuel Economy: Without an accurate EGT reading, the ECU will often default to a rich fuel mixture (more fuel, less air) as a safety measure. This will cause you to burn through fuel much faster than usual.
- Engine Hesitation: You might feel a stumble or hesitation during acceleration as the ECU struggles to manage the air-fuel ratio without a key piece of data.
The Root Causes: Uncovering the Common Problems
Now for the good news. This code is rarely caused by a catastrophic engine failure. The problem almost always lies in one of three areas, with one being far and away the most common culprit. Learning how to polaris axys code 173 diagnostics is mostly about knowing where to look first.
The Usual Suspect: Damaged Wiring and Connectors
On a snowmobile, every component is subjected to extreme vibration, temperature swings, and moisture. The wiring harness for the EGT sensor is particularly vulnerable.
Over 90% of the time, code 173 is caused by a simple wiring issue. Look for wires that have rubbed against the frame or engine, melting on the hot exhaust pipe, or a connector that’s full of water and corrosion. The connection point itself can also become loose over time.
The Faulty EGT Sensor Itself
While less common than wiring issues, the EGT sensor can fail. Like any electronic component, it has a finite lifespan. Over time, internal components can break down, or the sensor tip can become so coated in carbon that it can no longer read temperatures accurately.
The Long Shot: ECU Issues
This is extremely rare. Before you even consider the ECU as the problem, you must exhaustively rule out any possibility of a wiring or sensor issue. An ECU failure is the absolute last thing to suspect, not the first.
Your Step-by-Step Polaris AXYS Code 173 Guide to Diagnosis and Repair
Alright, let’s get our hands dirty. This process is designed to start with the easiest and most common fixes first. Follow these steps in order, and you’ll likely find your problem without much fuss.
Tools You’ll Need for the Job
You won’t need a full professional shop, but having these basics will make the job much easier:
- A basic socket and wrench set
- Torx bits (for removing side panels)
- A good flashlight or headlamp
- Multimeter (for more advanced testing)
- Electrical contact cleaner
- Dielectric grease
- Zip ties and electrical tape
- A replacement EGT sensor (if needed)
Step 1: Visual Inspection – The 10-Minute Check
Start by removing the right-side panel and the exhaust valve cover to get a clear view. First, locate your EGT sensor. It’s a small probe screwed directly into the Y-pipe of your exhaust, just before it enters the main pipe.
Once you’ve found it, begin carefully tracing its wire harness back towards the main harness. Use your flashlight and look for:
- Chafing: Are there any spots where the wire’s protective sheathing is rubbed through, exposing the copper wires inside? Pay close attention to where the harness bends or passes near sharp edges of the frame.
- Melting: Check for any signs that the harness has made contact with the hot exhaust pipe. The plastic will look shiny, melted, or brittle.
- Loose Connectors: Follow the wire to its first connection point. Is it plugged in securely? Give it a gentle tug to be sure.
This simple visual check is one of the most important polaris axys code 173 tips. Most issues are found right here.
Step 2: Clean and Secure the Connection
If the visual inspection doesn’t reveal an obvious break, your next step is the connector. Carefully unplug it. You may need to press a small locking tab to release it.
Look inside both ends of the connector. Do you see any green or white crusty buildup? That’s corrosion, and it’s a notorious signal killer. Also, check for any pins that look bent or pushed back into the connector.
Spray both sides of the connector generously with electrical contact cleaner and let it air dry completely. If you saw corrosion, you can use a small pick or brush to gently clean it out before spraying. Once dry, apply a small dab of dielectric grease to the inside of the connector. This grease doesn’t conduct electricity but keeps moisture and oxygen out, preventing future corrosion.
Plug the connector back in firmly until you hear or feel it click. Clear the code (often by cycling the key a few times or letting the sled run) and see if it returns.
Step 3: Testing the EGT Sensor (For the Advanced DIYer)
If the wiring looks perfect and the connection is clean, the sensor itself might be the issue. To test it, you’ll need a multimeter set to measure resistance (Ohms Ω). You’ll also need the factory service manual for your specific model to get the correct resistance specifications.
Unplug the sensor and touch the two probes of your multimeter to the two pins on the sensor side of the connector. Compare the reading on your multimeter to the spec in the manual. If the resistance is far outside the specified range, the sensor is bad and needs to be replaced.
Pro Tip: If you don’t have a service manual or are uncomfortable using a multimeter, this is a good point to stop and consider visiting a dealer. A new sensor is cheaper than guessing and potentially damaging other components.
Step 4: Replacing the EGT Sensor
If you’ve confirmed the sensor is faulty, replacement is straightforward. Let the exhaust cool completely first!
- Unplug the old sensor.
- Using the correct size wrench, carefully unscrew the old sensor from the exhaust pipe. It might be tight, so be firm but steady.
- Apply a small amount of high-temp anti-seize compound to the threads of the new sensor, being careful not to get any on the sensor tip itself.
- Screw the new sensor in and tighten it to the manufacturer’s specified torque (or just snug—don’t overtighten it).
- Route the new wire along the same path as the old one, ensuring it’s secured away from heat and sharp edges with zip ties. Plug it in.
Polaris AXYS Code 173 Best Practices: Prevention and Care Guide
Fixing the problem is great, but preventing it from happening again is even better. Adopting a few best practices into your maintenance routine offers significant benefits of polaris axys code 173 prevention and overall machine longevity.
Proactive Harness Protection
Take a look at the EGT sensor wire’s path. If it looks vulnerable, add some protection. You can buy flexible plastic wire loom or high-temp heat sleeve at any auto parts store. Wrap it around the wire in high-risk areas and secure it with zip ties. This simple step is a fantastic long-term solution.
The “Eco-Friendly” Angle: Why a Quick Fix Matters
Thinking about a sustainable polaris axys code 173 fix might sound strange, but it’s practical. When your sled is running in limp mode with a rich fuel mixture, it’s wasting a significant amount of fuel and producing higher emissions. A proper, timely repair isn’t just good for your engine; it’s more efficient and better for the environment you ride in. A healthy engine is an eco-friendly polaris axys code 173 solution.
Frequently Asked Questions About Polaris AXYS Code 173
Can I still ride my sled with code 173?
While the sled may still run, it’s strongly discouraged. Limp mode is activated to prevent engine damage. Continuing to ride, especially for long periods, could lead to more serious issues like fouled spark plugs or excessive carbon buildup due to the rich fuel condition.
How much does it cost to fix Polaris AXYS code 173?
The cost can vary dramatically. If it’s a simple chafed wire that you can repair yourself with some electrical tape and a zip tie, the cost is virtually zero. If you need to replace the EGT sensor, the part itself typically costs between $100 and $200. If you take it to a dealer, expect to add 1-2 hours of labor for diagnosis and repair.
Do I need a special tool to clear the code after the repair?
No. On most Polaris models, once the underlying fault is corrected, the code will clear itself after a few key cycles or a short period of run time where the ECU confirms the sensor is reading correctly again.
Tackling a check engine light can be intimidating, but the polaris axys code 173 is one you can absolutely handle. By following a logical diagnostic process—inspecting the wiring, cleaning the connection, and testing the component—you can save yourself time, money, and a trip to the dealer.
Now you have the knowledge and the confidence to get your machine back in peak condition. Get it fixed, get back on the snow, and ride safe!
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