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

Toyota Corolla E170 (2013-2019)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

481 words

Problem Statement

Learn how to diagnose and fix the engine light issue in Toyota Corolla E170 (2013-2019). 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 systems to avoid shorts.
•Allow the engine to cool before inspecting or working on any components.

Symptoms

•Check engine light continuously illuminated
•Reduced engine performance or power
•Erratic engine idle or stalling
•Poor fuel economy
•Increased emissions (possible smell of gasoline)

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific fault codes.
2
Inspect the gas cap for proper sealing and any signs of damage.
3
Check the vehicle’s engine oil level and condition.
4
Examine the air filter for clogs or excessive dirt.
5
Inspect the exhaust system for leaks or blockages.
6
Test the vehicle's battery and alternator voltage to ensure proper electrical supply.

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
•Screwdriver set
•Multimeter
•Torque wrench

Parts Required

•Replacement gas cap
•Replacement air filter
•Electrical connectors (if needed)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific fault codes.
2
Inspect the gas cap for proper sealing and any signs of damage.
3
Check the vehicle’s engine oil level and condition.
4
Examine the air filter for clogs or excessive dirt.
5
Inspect the exhaust system for leaks or blockages.
6
Test the vehicle's battery and alternator voltage to ensure proper electrical supply.

Solution

1. Preparation

Gather tools and parts needed for repairs.
Disconnect the battery to prevent electrical short circuits.

2. Address Fault Codes

Use the OBD-II scanner to read the error codes.
Refer to the service manual for definitions and troubleshooting for each code.
Clear the codes after repairs to reset the check engine light.

3. Inspect and Replace Components

Gas Cap: If the gas cap is faulty:
- Remove the old gas cap.
- Install a new, OEM-spec gas cap.
Air Filter: If the air filter is dirty:
- Remove the air filter housing cover.
- Take out the old air filter and replace it with a new one.
- Reassemble the air filter housing.
Exhaust System: If leaks are found:
- Inspect the exhaust pipes and connections visually.
- Tighten or replace any loose or damaged components.

4. Electrical System Check

If battery or alternator issues are indicated:
- Use a multimeter to test battery voltage (should be around 12.6V with the engine off).
- Test alternator output (should be between 13.8V and 14.4V when the engine is running).
- Replace the battery or alternator as necessary.