why does my Toyota Corolla E170 (2013-2019) check engine light keep coming on

Toyota Corolla E170 (2013-2019)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

530 words

Problem Statement

Learn how to diagnose and fix the check engine light issue in your 2013-2019 Toyota Corolla E170. Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Engine

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical components.
•Ensure the engine is cool before performing maintenance to avoid burns.

Symptoms

•Check engine light illuminated
•Engine misfire or rough idle
•Decreased fuel efficiency
•Unusual noises from the engine
•Poor acceleration or loss of power
•Emission test failure

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific trouble codes.
2
Inspect the gas cap for damage or improper sealing, as a loose cap can trigger the check engine light.
3
Check the engine oil level and condition; low or dirty oil can affect engine performance.
4
Examine the spark plugs and ignition coils for wear or failure.
5
Inspect the air intake system for leaks or blockages, including the air filter.
6
Review the vehicle’s maintenance history for overdue services that could contribute to issues.

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
•Socket set
•Torque wrench
•Screwdrivers
•Pliers

Parts Required

•Spark plugs
•Ignition coils
•Air filter
•Gas cap

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific trouble codes.
2
Inspect the gas cap for damage or improper sealing, as a loose cap can trigger the check engine light.
3
Check the engine oil level and condition; low or dirty oil can affect engine performance.
4
Examine the spark plugs and ignition coils for wear or failure.
5
Inspect the air intake system for leaks or blockages, including the air filter.
6
Review the vehicle’s maintenance history for overdue services that could contribute to issues.

Solution

1. Preparation

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

2. Scan and Interpret Codes

Use the OBD-II scanner to retrieve the trouble codes.
Document the codes for reference and research their meanings.

3. Inspect and Replace Components

3.1 Gas Cap Inspection

Remove the gas cap and visually inspect for cracks or damage.
If damaged, replace the gas cap with a new one.

3.2 Spark Plug and Ignition Coil Replacement

Remove the engine cover (if equipped) using the appropriate socket.
Disconnect the ignition coil connectors.
Unscrew and remove the ignition coils and spark plugs.
Install new spark plugs and ignition coils, torquing spark plugs to manufacturer specification (typically around 13 lb-ft).

3.3 Air Intake System Check

Remove the air filter housing to access the air intake.
Inspect the air filter; replace if dirty.
Check for any visible leaks or cracks in the intake hoses.

4. Reset the Check Engine Light

Reconnect the negative battery terminal.
Use the OBD-II scanner to clear any stored error codes.
Start the engine and observe if the check engine light remains off.