This section doesn’t currently include any content. Add content to this section using the sidebar.

Image caption appears here

Add your deal, information or promotional text

RV Holding Tank Sensors: How They Work and How to Clean Them

  • 2 min read

Key Points:

  • Sensors typically misread because they are covered by something other than water/liquid.
  • We have easy instructional steps to help you clean and restore sensors in all types of tanks.

Sensors can cause some unneeded headaches, and in this guide will give you all the resources necessary to understand how they work, why they’re misreading, and how to fix them.

How do RV tank sensors work?

In most cases, an RV tank sensor is mounted on the inside of your tank but some models are mounted on the exterior. Sensors are typically situated in several places on the wall of your tank to indicate holding tank levels by thirds or by quarters. They are made fairly cheaply, which is why they can easily break or begin misreading. 

What Causes RV Holding Tank Sensors To Misread?

The primary reason interior holding tank sensors begin misreading is because something is covering it up, making it seem like the tank is filled to some extent when in fact, it could be completely empty. Sensors can be easily cleaned, which is the best way to determine if they are truly broken; if they are still misreading after several of the best cleaning treatments, they likely just need to be replaced. 

Guide: Why Are My RV Sensors Not Working? How Do I Fix Them?  

If it seems like you’re always struggling to keep your sensor probes functional, you might consider installing exterior-mounted sensors, like SeeLevel RV Tank Sensors . Aftermarket sensors like this are a great option if you want more reliable readings on tank levels.

How to Clean Your RV Holding Tank Sensors

Cleaning black tank sensors to restore them to proper functionality is easy and effective when using Restore-It and even easier using Dawn Ultra to clean gray/galley tank sensors.


We know you might be feeling a little cheated by the limited amount of info we’ve shared in this guide, but the good news is we’ve created a whole series of articles dedicated to understanding how sensors work and why they misread, steps for cleaning them when they misread, and how to prevent them from misreading in the future. 

As an Amazon Associate, Unique Camping + Marine earns from qualifying purchases

Adopt The Unique Method

You bought your RV so you could enjoy life and spend time with family and friends. The last thing you want to do is waste precious time and money on fixing wastewater holding tank problems. Keeping your tanks in peak operating condition doesn’t have to be hard, confusing, or expensive if you follow our proven process: The Unique Method.

The Unique Method is a comprehensive tank care plan that we developed after years of conversations with real customers facing real problems. The Unique Method provides you with simple, preventative steps to stop odors, clogs, and sensor problems before they start so you can spend less time worrying about your holding tanks and more time enjoying the freedom and adventure of RVing. Try it yourself and see why thousands of campers trust their RVs with The Unique Method every day.

Learn More