Dodge Avenger Automatic Transmission Output Speed Sensor Guide (1995-2000)
Solve your first-generation Avenger's erratic shifting and speedometer problems by choosing the right replacement sensor.
- This guide is for the 1995-2000 Dodge Avenger coupe, not later sedan models.
- A faulty sensor causes a P0720 code, erratic shifting, and speedometer failure.
- For this electronic part, choosing a premium aftermarket brand like NGK (NTK) or Standard Ignition is recommended over economy options.
- Replacement is simple, requiring basic tools and less than an hour, making it a great DIY-friendly repair.
Understanding the Output Speed Sensor for Your 1995-2000 Dodge Avenger
This guide focuses specifically on the first-generation Dodge Avenger coupe, produced from 1995 to 2000. These models were built on a Mitsubishi platform and have known issues with transmission sensors that can cause significant driving problems. The output shaft speed sensor is a critical electronic part that tells your car's computer how fast you are going, which directly impacts transmission shifting and speedometer readings.
Common Symptoms of a Failing Output Speed Sensor
When the output speed sensor begins to fail, your Avenger will give you clear signs. Ignoring them can lead to unsafe driving conditions and potential transmission damage.
- Check Engine Light: The most common sign is a check engine light with diagnostic trouble code P0720, which points directly to a malfunction in the output speed sensor circuit.
- Erratic and Harsh Shifting: Your transmission may slam into gear, hesitate, or get stuck in one gear (known as 'limp mode').
- Inaccurate Speedometer: The speedometer might jump around, show the wrong speed, or drop to zero while you are driving.
- Cruise Control Not Working: A bad speed signal will often cause the cruise control system to stop working.
- Stalling: In some cases, the vehicle may stall when you come to a stop.
Choosing the Right Aftermarket Sensor
For a critical electronic part like a speed sensor, quality matters. While OEM Mopar parts are a reliable option, premium aftermarket brands offer similar quality for less money. Given the low cost of even the best aftermarket options, saving a few dollars on an economy brand is not recommended.
Aftermarket Brand Tiers
| Tier | Brands | Typical Price | Notes |
|---|---|---|---|
| Premium Aftermarket | NGK (NTK), Standard Ignition (SMP) | $25 - $39 | These brands are known for making high-quality sensors that often meet or exceed OEM specifications. They are a reliable choice for long-term performance, which is important for the Mitsubishi-based electronics in your Avenger. |
| Standard / Economy | ATP, Pioneer Cable, Skyward, True Tech | $14 - $24 | These brands provide a budget-friendly solution. However, for electronic sensors, failure rates can be higher than premium brands, potentially leading to the same problem recurring sooner. |
Cost to Replace Dodge Avenger Output Speed Sensor
| Part Type | Estimated Cost |
|---|---|
| New OEM (Mopar) | $50 - $75 |
| New Aftermarket | $14 - $39 |
| Shop Labor | $100 - $150 |
Installation Tip
The output speed sensor is located on the outside of the transmission. On the 1995-2000 Avenger, you can get better access by removing the plastic air filter box. The sensor is held in by a single bolt and can be removed with a 1-inch socket. Because it's a simple job, you can save on labor costs by doing it yourself in under an hour. A small amount of transmission fluid might drip out, so have a rag ready.
Frequently Asked Questions
Where is the output speed sensor located on a 1995-2000 Avenger?
The sensor is on the transmission housing. To access it easily, you will likely need to remove the engine airbox. There are two similar-looking sensors; the output sensor is typically further back on the transmission case.
Should I replace the input and output speed sensors at the same time?
Many mechanics recommend it. The input and output sensors are similar parts that experience the same conditions. If one has failed, the other may not be far behind. Replacing both at once can save you from having to do the job again in the near future.
Can I drive my Avenger with a bad output speed sensor?
It is not recommended. Your car may enter a 'limp mode' where it gets stuck in a single gear, your speedometer will not work, and shifting can be harsh and unpredictable. This is unsafe and can cause further damage to your transmission. You should get the vehicle repaired as soon as possible.
What tools are needed for the replacement?
You will need basic hand tools, including a ratchet with an extension, a 1-inch socket for the sensor, and a flat blade screwdriver or socket to loosen the airbox clamps.
Technical Specifications
OEM Part Numbers: 4800879
The sensor is a magnetic pickup that generates a signal as the transmission output shaft rotates. It typically uses a 2-pin connector and is threaded into the transmission case.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
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