How to Fix Canon MX492 Error 5B02: Understanding the Ink Absorber Full Warning

Question:
I’ve been using my Canon MX492 inkjet printer for a while now, and recently, it started displaying an error code: 5B02. What does this error mean, and is there any way to fix it?

Answer:

Now, regarding the Canon MX492 error code 5B02, this is a fairly common issue among Canon inkjet printers and is officially known as the "ink absorber full" error. This error is part of Canon’s internal maintenance system. Over time, during normal use, your printer performs cleaning cycles that discharge small amounts of ink into a built-in sponge pad known as the ink absorber. When the printer estimates that the pad is full—or nearing its capacity—it stops functioning and displays the 5B02 error to prevent potential ink overflow.

Why This Happens

The 5B02 error isn’t triggered by a sensor reading the actual physical fullness of the ink absorber pad. Instead, it’s based on a preset usage counter. Once the printer hits a predefined number of cleanings and print jobs, it assumes the pad is saturated—even if it’s not completely full yet.

For many Canon models, especially mid-range or higher-end printers, there’s a workaround: users can search for a "Canon Service Tool" on platforms like eBay. These tools allow you to reset the internal counter and bypass the ink absorber error—essentially giving your printer a new lease on life after replacing or cleaning the sponge.

The Bad News for MX492 Owners

Unfortunately, the Canon MX492 is categorized as a low-cost or "disposable" model. Canon has not released service tools compatible with this specific series. That means, unlike other models, there's no official or third-party method to reset the ink absorber counter on the MX492.

What this really means is that Canon does not intend for this model to be serviced for long-term use. Once the 5B02 error appears, the manufacturer expects users to retire the printer and replace it entirely. There are no official repair kits, reset tools, or firmware-level bypasses available for this printer.

We understand how frustrating that can be—especially if the printer is otherwise functioning well.

Addressing printer issues can be a complicated affair due to the hands-on nature of the problems. So, we're not able to provide remote troubleshooting, suggestions, or support for printer repairs. We offer an in-person evaluation and repair service via our local diagnostic facility (https://bchtechnologies.com/printer-repair-service). Given the high demand, we operate on a first-come, first-served basis. So, it might take a few weeks before we can get your printer to drop it off. Our services are structured to repair either a whole printer or specific parts, with clear instructions on how to proceed. However, we acknowledge that our rates aren't the most economical. Thus, we highly recommend that you resort to self-help via online research. You can start by checking out YouTube or visiting our YouTube channel's homepage (https://youtube.com/@bchtechnologies). Look for specific videos using the search icon next to "About" on the right-hand side of the menu bar. I receive dozens of queries every day asking about videos for specific topics. Having created videos over the past nine years, it's challenging to remember every single one. Therefore, using YouTube's search function would be most efficient. Plus, YouTube might suggest relevant videos from other channels that could assist you.

Thanks again for contacting us, and we hope this helps you understand why the 5B02 error appears and what your options are. We're grateful to have your support and encourage you to continue learning through our content and the broader printer repair community.