why does my Honda Accord have a check emissions system message

Honda Accord 9th Generation (2013-2017)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

555 words

Problem Statement

Learn how to diagnose and fix the 'Check Emissions System' message in Honda Accord. Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Exhaust System

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical components.
•Allow the exhaust system to cool before handling any parts.

Symptoms

•Check engine light illuminated
•Decreased fuel efficiency
•Rough idle
•Unusual engine noises
•Strong odor of fuel or exhaust
•Failed emissions test

Diagnostic Steps

1
Scan the vehicle's onboard diagnostic system using an OBD-II scanner to retrieve any error codes.
2
Inspect the gas cap for damage or improper sealing and perform a pressure test if necessary.
3
Check for leaks in the vacuum hoses connected to the intake manifold and emissions control components.
4
Inspect the oxygen sensors and catalytic converter for proper function and signs of wear.
5
Evaluate the exhaust system for cracks or damage that could lead to increased emissions.
6
Review recent maintenance and repair history for any related work done on the emissions system components.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II scanner
•Multimeter
•Socket set
•Torque wrench
•Screwdrivers

Parts Required

•New gas cap (if necessary)
•Replacement vacuum hoses (if damaged)
•Oxygen sensors (if faulty)
•Catalytic converter (if necessary)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Scan the vehicle's onboard diagnostic system using an OBD-II scanner to retrieve any error codes.
2
Inspect the gas cap for damage or improper sealing and perform a pressure test if necessary.
3
Check for leaks in the vacuum hoses connected to the intake manifold and emissions control components.
4
Inspect the oxygen sensors and catalytic converter for proper function and signs of wear.
5
Evaluate the exhaust system for cracks or damage that could lead to increased emissions.
6
Review recent maintenance and repair history for any related work done on the emissions system components.

Solution

1. Preparation

Ensure the vehicle is parked on a level surface, and turn off the engine.
Gather tools and replacement parts.
Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Gas Cap

Remove the gas cap and inspect for cracks or damage.
If damaged, replace with a new gas cap. Ensure it is a manufacturer-recommended part.
Reinstall the gas cap securely, ensuring it clicks into place.

3. Check and Repair Vacuum Leaks

Locate the vacuum hoses near the intake manifold.
Visually inspect the hoses for cracks or disconnections.
Replace any damaged hoses with new ones; ensure all connections are tight.

4. Test and Replace Oxygen Sensors

Identify the upstream and downstream oxygen sensors.
Use a multimeter to test each sensor's voltage output.
Replace any faulty oxygen sensors, ensuring to use OEM parts.

5. Inspect and Replace Catalytic Converter (if necessary)

Check for signs of physical damage or blockage in the catalytic converter.
If the catalytic converter is found to be faulty, replace it following these sub-steps:
- Disconnect the exhaust pipes from the catalytic converter using a socket set.
- Remove the old catalytic converter and install the new one, ensuring proper alignment.
- Reconnect the exhaust pipes and tighten all connections to manufacturer torque specifications.