Seeing B125 on your Acura’s display means an engine oil and filter change with a multi-point vehicle inspection is due, along with a tire rotation, engine and cabin air filter replacement with a drive belt inspection and an engine coolant change.
The letter and the numbers are read separately. “B” is the main service; every digit after it is an additional job tracked on its own clock. A code with several digits is not one big procedure — it is several unrelated services that happened to come due in the same week.
You are not limited to an Acura dealer for B125. The two brands share a parts network, which means a Honda service department can carry out the same work, and independent specialists familiar with the marque are usually cheaper again.
Acura B125 Service Cost
Budget $370 to $625 for the Acura B125 service. The spread reflects genuine differences in engine, fluid volume and shop rates rather than padding, and because B125 bundles separate jobs, an itemized quote tells you far more than a single figure.
| Item | What it covers | Typical cost |
|---|---|---|
| “B” | Oil and filter change, plus multi-point inspection | $90 – $180 |
| “1” | Tire rotation | $30 – $45 |
| “2” | Engine and cabin air filters, drive belt inspection | $100 – $150 |
| “5” | Engine coolant | $150 – $250 |
| Total Acura B125 service | $370 – $625 | |
| Doing it yourself (parts only) | around $205 | |
The Coolant Change in B125
Sub-item 5 is an engine coolant replacement, and it is the longest-interval job in B125 by a wide margin. Acura fills these cars with Type 2 blue long-life coolant, and the first replacement is not due until around 10 years or 120,000 miles. After that it comes round roughly every 5 years or 60,000 miles. Plenty of owners sell the car before ever seeing a 5.
Use Acura Type 2 or a coolant explicitly certified as compatible with it. The universal green antifreeze sold at parts counters uses a different corrosion inhibitor package, and mixing chemistries can drop a gel out of suspension that blocks the radiator and heater core. Acura’s coolant comes pre-mixed and is not meant to be diluted further.
The work is more than draining and refilling. These engines are good at trapping air, and a pocket left in the system creates a hot spot and a temperature needle that wanders. Bleeding the system properly through the bleeder screw with the engine at operating temperature is the step that separates a coolant service done right from one that hands you an overheating problem you did not previously have.
When Is the Acura B125 Service Due?
Mileage is the wrong way to think about it. Acura’s algorithm watches how the engine is actually used — operating temperature, trip duration, load, revolutions — and adjusts accordingly. Two identical cars can be thousands of miles apart when B125 appears, and both are correct.
The countdown is visible before it becomes urgent: a wrench symbol at 15% remaining oil life, a firmer message at 5%, and a negative distance readout once it passes zero telling you how far past due you now are.
Which Acuras Display B125?
B125 is not model-specific. It can appear on the MDX, RDX, TLX, ILX, Integra, RLX, ZDX or TSX. What changes between them is the cost rather than the work: bigger engines take more oil, some require different fluids, and labor times vary with how accessible everything is.
Check your owner’s manual for the exact fluid specifications your engine needs before booking.
Is Acura B125 Service Free Under Complimentary Maintenance?
Partly at best. Acura’s program covers A1 and B1 work — oil, filter, tire rotation and inspection — for two years or 24,000 miles on 2023 and 2024 cars. For 2025 models it shrank to the first scheduled service inside 12 months or 12,000 miles. Everything in B125 beyond that basic scope is chargeable.
The practical move is to ask for an itemized invoice rather than a single number, because the oil and rotation line may still be covered while the rest is not. The work has to happen at a participating Acura dealer with Acura Genuine parts and oil, and the clock runs from the car’s original in-service date, not the day you bought it.
What B125 Means for SH-AWD Acuras
The B125 work itself is identical whether your Acura drives the front wheels or all four. What changes is what tends to arrive alongside it. Super Handling All-Wheel Drive uses a torque-vectoring rear unit that Honda does not fit to its own models, and it carries a fluid service of its own: sub-item 6, rear differential fluid, due at around 15,000 miles initially and every 30,000 miles after.
So if you drive an SH-AWD MDX, RDX, TLX or ZDX, do not be surprised to see B125 arrive with a 6 attached. Front-drive Acuras never show a 6, because there is no rear differential to service.
Related Acura Service Codes
- Acura B123 service code
- Acura B135 service code
- Acura B124 service code
- Acura B12 service code
- Acura B15 service code
- Acura B1237 service code
- Acura A123 service code
- Acura A135 service code
- All Acura Maintenance Minder codes — the full reference table
- How to reset the Acura Maintenance Minder
Acura B125 Service FAQ
What does the Acura B125 code mean?
The “B” is an oil and filter change with a multi-point inspection, and each digit after it is a separate job that has come due at the same time. For B125 those are a tire rotation, engine and cabin air filter replacement with a drive belt inspection, an engine coolant change. It is a bundle of independent services, not one procedure.
How much does the Acura B125 service cost?
Typically $370 to $625 at a dealer or independent shop, depending on your model and local labor rate. The breakdown by sub-item is in the table above. Acura and Honda dealer pricing is broadly comparable, so a Honda service department is worth a call for a second quote.
Can I do the Acura B125 service myself?
Partly. The oil and the tire rotation are straightforward at home. The coolant needs correct bleeding afterwards, which is the step most home attempts skip and the one that causes overheating. Parts alone come to roughly $205.
Is B125 covered by Acura complimentary maintenance?
Not fully. The program covers A1 and B1 services for two years or 24,000 miles on 2023 and 2024 cars, and only the first scheduled service within 12 months or 12,000 miles on 2025 models. B125 includes work beyond that, so expect the additional items to be chargeable. The oil and rotation portion may still be covered, so ask for an itemized invoice.
Does the B125 code mean something is wrong with my Acura?
No. B125 is a maintenance reminder shown with a wrench symbol, generated by the Maintenance Minder’s own countdown. It is not a diagnostic trouble code. A check engine light comes from a different system entirely and points to a stored fault. If both are showing they are unrelated, and the check engine light is the one to look at first.
How do I reset the B125 code?
An Acura dealer will reset it as part of the job. Doing it yourself: touchscreen models use Settings, then Vehicle, then Maintenance Reset, while older cars use the SEL/RESET stalk button or trip knob held for around ten seconds with the ignition on. On a multi-item code like B125 you can reset sub-items individually — do that rather than clearing everything, or the car will stop tracking jobs you have not actually done. Our Acura Maintenance Minder reset guide covers each method by model.