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

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

599 words

Problem Statement

Learn how to diagnose and fix the check engine light issue in Toyota Corolla E170 (2013-2019). Step-by-step guide with symptoms and solutions.

Affected Component

Engine

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow engine to cool before opening the engine bay.

Symptoms

•Check engine light illuminated
•Vehicle running rough or misfiring
•Reduced fuel efficiency
•Increased emissions
•Poor acceleration or power loss
•Engine stalling intermittently

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific trouble codes.
2
Inspect the gas cap for tightness or damage; a loose or faulty cap can trigger the check engine light.
3
Check engine oil and coolant levels to ensure they are within the correct range.
4
Visually inspect the spark plugs and ignition coils for wear or damage.
5
Examine the air intake system for leaks or blockages, including the air filter.
6
Test the fuel system pressure to ensure it is within the manufacturer's specifications.

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
•Multimeter
•Fuel pressure gauge

Parts Required

•Spark plugs
•Ignition coils (if faulty)
•Air filter
•Fuel filter (if needed)
•Gas cap (if damaged)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific trouble codes.
2
Inspect the gas cap for tightness or damage; a loose or faulty cap can trigger the check engine light.
3
Check engine oil and coolant levels to ensure they are within the correct range.
4
Visually inspect the spark plugs and ignition coils for wear or damage.
5
Examine the air intake system for leaks or blockages, including the air filter.
6
Test the fuel system pressure to ensure it is within the manufacturer's specifications.

Solution

1. Preparation

Tools Required: OBD-II scanner, socket set, torque wrench, multimeter, fuel pressure gauge.
Safety Warnings: Disconnect the battery before working on electrical systems. Allow engine to cool before opening the engine bay.

2. Address Error Codes

Use the OBD-II scanner to retrieve and document any error codes.
Research the codes to understand the potential issues.
Clear the codes and take the vehicle for a test drive to see if the check engine light returns.

3. Inspect and Replace Spark Plugs

Remove the ignition coil(s) using the socket set.
Take out the spark plugs with a spark plug socket.
Inspect the condition of the spark plugs; replace if worn, carbon-fouled, or damaged.
Reinstall the new or cleaned spark plugs and ignition coil(s) to the specified torque (usually around 12-15 ft-lbs).

4. Check Fuel System

Connect the fuel pressure gauge to the fuel rail.
Turn the ignition on (without starting the engine) to check for proper fuel pressure.
If pressure is below specifications, inspect the fuel pump and filter for issues; replace components as necessary.

5. Inspect and Clean Air Intake System

Remove the air filter and inspect for dirt and blockages; replace if necessary.
Check for any cracks or loose fittings in the intake tubing.
Clean the mass airflow sensor (if applicable) with appropriate cleaner.

6. Verify Emission Components

Inspect the exhaust system for leaks or damage.
Check the operation of the catalytic converter and oxygen sensors; replace if faulty.