Honda Code B123: (Causes & 100% Guaranteed Fixes!)


Honda Code B123

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So, you’ve come across a ‘Honda Code B123’ on your car’s dashboard and you’re wondering what it means.

Put simply, the Honda code B123 is a maintenance code that signifies your vehicle needs an oil and filter change, tire rotation, and inspection of the drive belt.

In this article, we’ll delve deeper into what triggers this specific code to pop-up and how best to address it without causing further harm to your beloved car. Let’s kick start our engines!

Honda Code B123 signifies comprehensive maintenance for your Civic, including oil and filter replacement, brake inspection, and fluid checks. Ensure timely service for optimal performance. For intricate tasks, trust authorized Honda service centers to maintain your vehicle’s integrity.

What is Honda Code B123?

Honda Code B123

Honda Code B123 is a maintenance code that signals the need for certain services on your vehicle. Here’s what each character in the code represents:

  • B – Indicates required service related to engine oil and filter, as well as inspections of brakes, parking brake adjustment, tie rod ends, steering gearbox, and boots.
  • 1 – Signifies tire rotation.
  • 2 – Stands for replacement or inspection of air cleaner element and dust & pollen filter. Inspection of drive belt also comes under this category.
  • 3 – Denotes transmission fluid replacement.

This maintenance code system helps ensure your Honda remains in excellent condition by informing you about necessary servicing tasks.

BEngine Oil and Filter Change + Inspections
1Tire Rotation
2Air Cleaner Element Replacement/Check
3Transmission Fluid Replacement

The cost to address Honda Code B123 maintenance is around $350 to $400. Factors like location, dealership rates, and additional services may influence the total expense. Contact your local Honda dealership or trusted auto service center for an accurate estimate tailored to your specific needs.

Here you can see in the below image one of our reader got quoted for $350 from a honda dealer to fix this issue:

Honda Code B123

Remember: Timely vehicle maintenance ensures optimal performance and longevity!

Understanding the Meaning of Each Component in Honda Code B123

Honda code B123 is a maintenance code that your vehicle may display. It’s broken down into three distinct parts:

Code B123 in Honda Civic indicates the following maintenance tasks:

  • Replace engine oil and oil filter
  • Inspect front and rear brakes, service as necessary
  • Check parking brake adjustment
  • Inspect tie rod ends, steering gearbox, and boots
  • Inspect suspension components
  • Inspect driveshaft boots
  • Inspect brake hoses and lines (Including ABS/VSA)
  • Inspect all fluid levels and condition of fluids
  • Inspect exhaust system
  • Inspect fuel lines and connections

Additional Codes:

  • Code 1: Rotate tires
  • Code 2: Replace air cleaner element, replace dust and pollen filter, inspect drive belt
  • Code 3: Replace transmission fluid

For a detailed understanding and proper execution, it is recommended to consult the Honda manual. Regular maintenance is crucial for optimal vehicle performance.

Here’s a quick table summary:

BBrake Inspection
1Tire Rotation
2Replace Engine Air Filter, Check Drive Belts
3Transmission Fluid Replacement

Remember, always get these services done by professionals. Proper maintenance is key to keeping your Honda running at its best!

How to Diagnose Honda Code B123?

Here’s a step-by-step guide on how to diagnose the Honda code B123:

Invest in an OBD-II Scanner:

  1. Connect Your OBD-II Scanner:
    • Plug it into the dedicated port, usually located under the dashboard near the driver’s seat.
  2. Read the Error Codes:
    • Turn on your car (but don’t start it) and initiate a scan with your scanner.
  3. Find Code B123:
    • Look for this specific code among those displayed by the scanner.

Once you’ve successfully diagnosed that code B123 is present, refer to your vehicle’s service manual for further instructions specific to your model.

Common Causes of Honda Code B123:

This table shows common causes associated with this error code:

Old Engine OilCould be due time for an oil change
Dirty FiltersAir or oil filters may need replacement
Software IssueMay require system update

Remember, while diagnosing can be done at home, any repairs should ideally be performed by a professional mechanic.

Common Causes of Honda Code B123:

Honda code B123 signals maintenance issues related to oil and filter change, tire rotation, and comprehensive vehicle inspection. Here are the common causes for this:

  • Dirty Engine Oil: Prolonged use without changing can result in dirty engine oil which triggers the code.
  • Oil Filter Issues: If not changed regularly, it may cause the system to show B123 error.
  • Tire Rotation Ignored: The alert might also indicate that a tire rotation is due.

Here’s a table outlining these problems and their possible solutions:

Dirty Engine OilChange engine oil
Oil Filter IssuesReplace oil filter
Tire Rotation IgnoredPerform tire rotation


  1. Regularly check your car’s health.
  2. Don’t ignore warning signs like strange noises or lights on your dash.
  3. Keep track of when you last performed maintenance tasks such as an oil change or tire rotation.
  4. Consult with a professional if you’re unsure about anything regarding your vehicle’s upkeep.

Understanding what triggers Honda code B123 helps maintain your car in optimal condition while preventing potential damage from ignorance or neglect!

Step-by-Step Guide to Fixing Honda Code B123:

Honda code B123 might look complex, but it’s a simple maintenance task you can handle. Here’s how.

1. Gather Your Tools:

You’ll need:

  • Socket wrench
  • New oil filter
  • Funnel
  • Engine oil (check your manual for type)
  • Transmission fluid (if required)

2. Drain the Old Oil:

Honda Code B123

First, use your socket wrench to open the drain plug and let all old engine oil out into an appropriate container.

3. Replace the Oil Filter:

Honda Code B123

Next up, change out that old, grimy filter for a new one.

RemoveUse your hands or a special tool if needed to unscrew the existing filter
InsertScrew in your fresh filter by hand

4. Add New Oil:

Honda Code B123

Grab that funnel and start adding new engine oil slow and steady using these steps:

  • i) Place funnel in filler hole
  • ii) Pour in about half of what your car requires
  • iii) Let it settle before checking dipstick level
  • iv) Continue until full

Note: Avoid overfilling!

If “B” means brake service is also needed on top of 1-2-3 regular maintenance then:

5. Check Brake Fluid Levels:

It’s time to check those brakes!

  • a) Open hood
  • b) Find reservoir
  • c) Make sure fluid falls between ‘Min’ and ‘Max’ lines

And voila! Honda code B123 fixed at home – who knew? Just remember – always dispose of used fluids responsibly.

You can also watch this video to fix this issue:

When troubleshooting the Honda code B123, having the right tools can make a world of difference. Below are some essential tools you will need:

  • OBD2 Scanner: This is crucial to read and erase error codes.
  • Multimeter: Necessary tool to measure battery voltage or any other electrical issues.
  • Screwdrivers (Philips & Flathead): Useful for removing panels or parts if necessary.

Here’s a quick reference table that outlines each tool, its use, and why it’s important:

OBD2 ScannerReads and erases error codesPrimary tool for diagnosing problems
MultimeterMeasures electrical valuesEssential in identifying electrical faults
ScrewdriversRemoving/adjusting componentsHandy for general car repairs
  1. Start by connecting your OBD2 scanner to your vehicle’s diagnostic port. Your scanner should then display any fault codes present.
  2. If an electric issue seems likely, use your multimeter to check voltages around the circuitry.
  3. Finally, screwdrivers may be needed if adjustments or part removals become necessary during your troubleshooting process.

Remember – always refer back to these tools when dealing with Honda code B123!

Preventive Maintenance Tips to Avoid Honda Code B123:

Following these maintenance tips can help you avoid encountering the Honda Code B123:

  • Regularly check your oil levels: Low oil levels can lead to engine damage and trigger this error code.
  • Keep an eye on tire pressure: Incorrect tire pressure could cause issues with your vehicle’s stability control system.
  • Make sure your brakes are in good condition: Worn out brake pads or rotors may contribute to the appearance of this error.

For a more detailed preventive care routine, refer to the table below:

Change Engine OilEvery 3,000 miles or every 3 months
Check Tire PressureAt least once a month
Replace Brake Pads/RotorsEvery 25,000 – 70,000 miles

Remember that regular servicing is key when it comes to maintaining your vehicle’s health. By staying proactive with these steps above, you’ll keep Honda code B123 at bay!


  1. Use only manufacturer-recommended parts for replacements as incompatible parts could lead to serious issues.
  2. Never skip scheduled services as doing so might result in unnoticed problems escalating into major repairs.

Keeping up with regular checks and maintenance not only keeps away trouble codes like B123 but also ensures optimal performance and longevity of your car!

Frequently Asked Questions About Honda Code B123:

What does Honda code B123 mean?

The B123 code is a maintenance code and simply means that your vehicle requires scheduled service. Each letter in the code corresponds to a specific type of service:

‘B’ refers to oil and filter change
‘1’ points towards tire rotation
‘2’ suggests replacing engine air filter and cabin air filter
‘3’ indicates it’s time for transmission fluid replacement.

How often will I see this code?

The frequency depends on various factors such as:

Your vehicle model.
How frequently you drive.
Driving conditions.

However, typically, most drivers report seeing this around every 10,000-20,000 miles.

Can I perform these services myself?

Yes! If you’re comfortable performing basic car maintenance tasks like changing oil or rotating tires – go ahead! However remember that if things get complicated – don’t hesitate reaching out for professional help!

Is driving with the B123 code safe?

Yes, you can drive without immediate harm but should schedule an appointment soon. Ignoring this could lead to more serious issues over time.

BOil and Filter Change
1Tire Rotation
2Replace Engine Air Filter and Cabin Air Filter
3Transmission Fluid Replacement

Troubleshooting Tips for Other Common Honda Diagnostic Codes:

When it comes to Honda cars, the B123 code is not the only diagnostic trouble code (DTC) you might encounter. Here are some common DTCs and tips to troubleshoot them.

  • P0300 – Random/Multiple Cylinder Misfire Detected This can be due to a variety of issues like faulty spark plugs or fuel injector problems. Regularly check and replace these components if needed.
  • B0159 – Ambient Air Temperature Sensor Circuit High Try replacing your ambient air temperature sensor as this code often signifies a malfunction in that component.
  • U0001 – High-Speed CAN Communication Bus Often related to electrical issues, this could mean a damaged fuse or broken wire. Inspect your vehicle’s wiring thoroughly.

Here’s an easy-to-follow chart summarizing these codes:

CodePossible CauseSolution
P0300Faulty spark plugs / Fuel Injector ProblemsRegular Check & Replace if necessary
B0159Malfunctioning Ambient Air Temp SensorReplace the Sensor
U0001Electrical Issues (Damaged Fuse/Broken Wire)Thorough Wiring Inspection

Remember, while DIY troubleshooting can fix minor issues, more complex problems may require professional assistance. It’s always best practice to consult with a certified mechanic when dealing with DTCs.

Conclusion and final thoughts

When it comes to addressing the Honda code B123, you’ve got all the necessary details now.

This maintenance code alerts you that your vehicle requires oil and filter change, tire rotation, and a thorough inspection of specific components.

Remember to take these notifications seriously for maintaining optimal performance and longevity of your car.

Don’t sweat if you aren’t mechanically inclined; professional help is always available at authorized service centers.

The key takeaway is not to ignore this maintenance alert. Timely action can prevent minor issues from turning into major problems down the road for your Honda.

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