why does my Toyota Corolla E170 (2013-2019) have a check engine light

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

535 words

Problem Statement

Learn how to diagnose and fix check engine light issues in Toyota Corolla E170 (2013-2019). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

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 the engine to cool before opening any components related to the fuel or exhaust systems.

Symptoms

•Check engine light illuminated on the dashboard
•Rough idle or engine misfire
•Decreased fuel efficiency
•Loss of power during acceleration
•Unusual engine noises
•Emissions test failure

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify the specific issue.
2
Check the gas cap for damage or looseness; a faulty gas cap can trigger the check engine light.
3
Inspect the engine air filter for clogs or restrictions.
4
Examine the ignition system components, including spark plugs and ignition coils, for wear or damage.
5
Check fuel pressure to ensure the fuel system is functioning properly.
6
Inspect exhaust system components for leaks, including oxygen sensors and catalytic converter.

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
•Fuel pressure gauge
•Torque wrench

Parts Required

•Spark plugs
•Ignition coils (if needed)
•Fuel filter (if needed)
•Oxygen sensors (if needed)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify the specific issue.
2
Check the gas cap for damage or looseness; a faulty gas cap can trigger the check engine light.
3
Inspect the engine air filter for clogs or restrictions.
4
Examine the ignition system components, including spark plugs and ignition coils, for wear or damage.
5
Check fuel pressure to ensure the fuel system is functioning properly.
6
Inspect exhaust system components for leaks, including oxygen sensors and catalytic converter.

Solution

1. Preparation

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

2. Addressing Error Codes

Required Tool: OBD-II scanner
Connect the OBD-II scanner to the vehicle’s diagnostic port.
Read and document the Diagnostic Trouble Codes (DTCs).
Research the DTCs to determine the specific components that need attention.

3. Inspect and Replace Components

Ignition System:
- Remove the spark plug cover (if applicable).
- Use a socket set to remove the spark plugs and inspect them for wear; replace if necessary.
- Check ignition coils, replacing any faulty coils as indicated by the error codes.
Fuel System:
- Use a fuel pressure gauge to check the fuel pressure at the rail.
- Replace the fuel filter if clogged, and inspect the fuel injectors for proper operation.
Exhaust System:
- Inspect the oxygen sensors; replace any that are malfunctioning.
- Check for exhaust leaks; repair or replace gaskets and components as needed.

4. Reassembly and Testing

Reinstall any components that were removed.
Reconnect the negative battery terminal.
Start the engine and allow it to reach operating temperature.
Clear the error codes using the OBD-II scanner and monitor if the check engine light returns.