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

Toyota Corolla E170 (2013-2019)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

502 words

Problem Statement

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

Affected Component

Engine

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the engine to cool before performing any maintenance.

Symptoms

•Check engine light illuminated on the dashboard
•Rough idle or engine misfires
•Decreased fuel efficiency
•Unusual smells from the exhaust
•Engine stalling or hesitation during acceleration
•Increased emissions during inspection

Diagnostic Steps

1
Scan the vehicle's computer system using an OBD-II scanner to retrieve trouble codes.
2
Inspect the gas cap for proper sealing and any signs of damage.
3
Check the engine oil level and condition.
4
Examine the air filter for dirt or blockage.
5
Inspect the spark plugs and ignition coils for wear or damage.
6
Verify the functionality of the oxygen sensors and fuel injectors.

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
•Oxygen sensor socket
•Multimeter

Parts Required

•Replacement spark plugs
•Replacement ignition coils (if needed)
•Replacement oxygen sensors (if needed)
•Replacement gas cap (if needed)

Related Faults

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Diagnostic Steps

1
Scan the vehicle's computer system using an OBD-II scanner to retrieve trouble codes.
2
Inspect the gas cap for proper sealing and any signs of damage.
3
Check the engine oil level and condition.
4
Examine the air filter for dirt or blockage.
5
Inspect the spark plugs and ignition coils for wear or damage.
6
Verify the functionality of the oxygen sensors and fuel injectors.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a flat surface.
Disconnect the battery negative terminal for safety.

2. Address Fault Codes

Sub-step 1: Refer to the OBD-II scanner to identify specific trouble codes.
Sub-step 2: Research each code to determine the corresponding components that may need inspection or replacement.

3. Inspect and Replace Faulty Components

Sub-step 1: If the gas cap is found to be faulty, replace it with a new OEM part.
Sub-step 2: For worn spark plugs, remove old plugs using a socket wrench and install new plugs, ensuring they are gapped correctly to manufacturer specifications (typically 0.044 inches for the Corolla).
Sub-step 3: If ignition coils are faulty, unplug the electrical connector, remove the retaining bolts, and replace with new coils.
Sub-step 4: If oxygen sensors are indicated as faulty, carefully unscrew the sensor using an oxygen sensor socket and replace with a new one.

4. System Reset

Sub-step 1: Reconnect the battery terminal.
Sub-step 2: Use the OBD-II scanner to clear any stored trouble codes.
Sub-step 3: Start the engine and allow it to reach operating temperature to verify all systems are functioning correctly.