why does my Honda Civic 10th Generation (2016-2021) check engine light keep coming on

Honda Civic 10th Generation (2016-2021)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

501 words

Problem Statement

Learn how to diagnose and fix the check engine light issue in Honda Civic 10th Generation (2016-2021). Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Engine

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical components.
•Allow the engine to cool before performing any work to avoid burns.

Symptoms

•Check engine light illuminated
•Erratic idle or rough running
•Decreased fuel efficiency
•Engine stalling or hesitation during acceleration
•Unusual engine noises (knocking or pinging)
•Failed emissions test

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to retrieve fault codes.
2
Inspect the gas cap for proper sealing or damage.
3
Check engine oil levels and condition.
4
Examine the air filter for dirt or blockage.
5
Inspect spark plugs for wear or fouling.
6
Test the battery and alternator output to ensure proper voltage levels.

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
•Torque wrench
•Socket set
•Ratchet
•Pliers

Parts Required

•New gas cap (if damaged)
•New spark plugs (if worn)
•New air filter (if dirty)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to retrieve fault codes.
2
Inspect the gas cap for proper sealing or damage.
3
Check engine oil levels and condition.
4
Examine the air filter for dirt or blockage.
5
Inspect spark plugs for wear or fouling.
6
Test the battery and alternator output to ensure proper voltage levels.

Solution

1. Preparation

Gather tools and parts needed.
Disconnect the negative battery terminal to ensure safety during repairs.
Ensure the car is parked on a level surface with the engine off and cool.

2. Retrieve Error Codes

Connect the OBD-II scanner to the vehicle’s diagnostic port.
Turn the ignition to the "ON" position without starting the engine.
Record any error codes displayed and refer to the vehicle's service manual for code definitions.

3. Inspect and Replace Components

A. Gas Cap Inspection

Check the gas cap for cracks or missing seals.
If damaged, replace the gas cap with a new one.

B. Spark Plug Inspection

Remove the ignition coil or spark plug wires.
Extract the spark plugs using a socket and ratchet.
Inspect for wear; if worn or fouled, replace with OEM-spec plugs.
- Torque new plugs to manufacturer's specifications (usually around 13-15 lb-ft).

C. Air Filter Replacement

Locate the air filter housing.
Open the housing and remove the old air filter.
Install a new air filter and secure the housing.

4. Clear Error Codes

Use the OBD-II scanner to clear the error codes after repairs.
Reconnect the negative battery terminal.

5. Final Checks

Start the engine and let it idle.
Listen for any abnormal sounds and monitor the idle stability.