Honda Maintenance Minder codes explained
A Honda Maintenance Minder code is one main letter plus optional numbers. A means replace the engine oil; B means replace the oil and filter and inspect the brakes, steering, suspension and fluid levels. Each number adds one job: 1 tires, 2 air filters and drive belt, 3 transmission fluid, 4 spark plugs and valve clearance, 5 coolant, 6 rear differential, 7 brake fluid. So B17 is an oil-and-filter service with the B inspections, a tire rotation and new brake fluid.
Honda does not give most of its cars a fixed-mileage service list. The car calculates the remaining engine oil life from how it is driven and shows a code when service is due. The definitions below come from Honda's own owner's manuals (2023 CR-V, 2022 Civic, 2022 Odyssey and 2022 HR-V). Where the models differ, the difference is listed.
How the Maintenance Minder decides when service is due
Honda's 2023 CR-V manual puts it in one sentence: "Based on the engine operating conditions, the remaining engine oil life is calculated and displayed as a percentage." There is no mileage target behind the number. A car that tows, idles or makes short trips reaches 0% sooner than one that cruises on the highway.
The messages follow the oil life:
| Oil life shown | Message | What Honda says to do |
|---|---|---|
| 15% (calculated 15 to 6) | Maintenance Due Soon | Inspect and service the listed items soon |
| 5% (calculated 5 to 1) | Maintenance Due Now | Service as soon as possible |
| 0%, then a negative distance after 10 miles | Maintenance Past Due | Inspect and service immediately |
From 15% down, the message appears every time you switch the car on. The codes shown with it are the jobs due at that oil change.
Main codes: A and B
| Code | Honda's description (2023 CR-V, US) |
|---|---|
| A | Replace engine oil |
| B | Replace engine oil and oil filter; inspect front and rear brakes; inspect tie rod ends, steering gearbox and boots, suspension components, driveshaft boots, brake hoses and lines (including ABS/VSA), all fluid levels and condition of fluids, exhaust system, fuel lines and connections |
The 2022 Civic adds a check of the expiration date on the temporary tire repair kit to code B. Honda also notes that the valves are adjusted during services A, B, 1, 2 or 3 if they are noisy.
An A service is only an oil change, not an oil-and-filter change. A B service is the fuller visit: new oil and filter plus a brake and chassis inspection. Which letter comes up is the car's own call, so there is no fixed A-B pattern to plan around.
Sub-codes 1 to 7
| Code | Honda's description (2023 CR-V, US) | Notes by model |
|---|---|---|
| 1 | Rotate tires | Same on every manual checked |
| 2 | Replace air cleaner element; replace dust and pollen filter; inspect drive belt | Same on every manual checked |
| 3 | Replace transmission fluid | Same on every manual checked |
| 4 | Replace spark plugs; inspect valve clearance | 2022 Odyssey (V6) adds "Replace timing belt and inspect water pump" |
| 5 | Replace engine coolant | Same on every manual checked |
| 6 | Replace rear differential fluid | Only on models with a rear differential (AWD). The 2022 Civic and 2022 Odyssey tables have no code 6 |
| 7 | Replace brake fluid | On the 2022 Civic, 2022 Odyssey and 2023 CR-V. The 2016-2022 HR-V has no code 7 |
Codes combine. A1 is an oil change and a tire rotation. B12 is the B service with a tire rotation and new air filters. B124 adds spark plugs and a valve check. On the Odyssey V6, code 4 also means a new timing belt and a water pump inspection, so a code 4 on that van is a much larger job than the same code on a Civic.
Where the models differ
The meaning of the letters and numbers is stable, but three differences matter when you read a code:
- Brake fluid. Newer manuals put brake fluid under code 7, with a time fallback: "If a Maintenance Minder message does not appear more than 36 months after the display for item 7 is reset, change the brake fluid every 3 years." The 2022 HR-V manual has no code 7 and says instead: "Independent of the Maintenance Minder information, replace the brake fluid every 3 years."
- Rear differential. Code 6 appears only on models built with a rear differential, such as AWD versions of the CR-V and HR-V.
- Timing belt. The Odyssey's V6 uses a timing belt, which Honda folds into code 4. Four-cylinder models in these manuals list only spark plugs and the valve-clearance check under code 4.
For model-by-model intervals, oil grades and capacities, see the Honda maintenance schedule, which lists every Honda model we cover side by side, or go straight to the Civic, CR-V, Accord or Pilot schedule.
What the Minder does not track
Honda's manuals keep a short list of rules outside the oil-life calculation:
- Annual oil change. "If a Maintenance Minder message does not appear more than 12 months after the display is reset, change the engine oil every year." A car driven a few thousand miles a year can sit at 40% oil life and still be due.
- Mountain driving. Driving in mountainous areas at very low speeds raises transmission temperature, and Honda says to change the transmission fluid every 25,000 miles if you regularly drive that way.
- Dust and soot. Replace the air cleaner element every 15,000 miles in dusty conditions, and the dust and pollen filter every 15,000 miles in urban areas with high concentrations of soot.
If your Honda lives on gravel roads, in a city with heavy diesel traffic, or climbs mountain grades at low speed, the Minder alone will under-service it. Add the fixed 15,000-mile filter changes and the 25,000-mile transmission fluid change from the manual to your own calendar.
How to reset the Maintenance Minder
Honda's 2023 CR-V manual is direct about why this matters: "Failure to reset the Maintenance Minder display after a maintenance service results in the system showing incorrect maintenance intervals, which can lead to serious mechanical problems." A dealer resets it after service; "if someone other than a dealer performs maintenance service, reset the Maintenance Minder display yourself."
On a 2023 CR-V (and other models with a left selector wheel on the steering wheel):
- Set the power mode to ON.
- Press the home button and roll the left selector wheel to the Maintenance Minder screen, then press the wheel.
- Press and hold the left selector wheel for about 10 seconds to enter the reset mode.
- Roll the wheel to the item you serviced, or to All due items.
- Press the wheel to reset the selected item, and repeat for other items.
On older models with a select/reset knob in the instrument cluster, such as the 2022 HR-V:
- Turn the ignition switch to ON.
- Press the select/reset knob repeatedly until the engine oil life shows.
- Press and hold the knob for 10 seconds or more, until the oil life and the codes blink.
- Press the knob for five seconds or more. The codes disappear and oil life returns to 100%.
Reset only the items that were actually done. Resetting code 7 without changing the brake fluid restarts its 36-month clock on fluid that is already old.
Canadian codes
Canadian-market manuals use the same sub-codes 1 to 7, with two changes: the oil-and-filter service is code 0 instead of B, and code 9 covers servicing the front and rear brakes and the chassis inspections that B includes in the US table.
Reading a code at the service desk
Honda's manual describes the codes as the maintenance items "which should be serviced at the same time that you replace the engine oil." Work on a quote that matches no code and none of the fixed rules above, such as a fuel system cleaning or an early coolant flush, is the shop's suggestion rather than Honda's schedule, and you can ask which line of the owner's manual calls for it.
Frequently Asked Questions
Vlad Kuzin
Developer of Pinion. Writes about car maintenance to help people save money and stay safe on the road.
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