what should I do if my Toyota Corolla E170 (2013-2019) fails emissions test?

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

519 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

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

Affected Component

Exhaust System

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 working on the exhaust system.

Symptoms

•Check engine light illuminated
•High levels of hydrocarbons (HC) or carbon monoxide (CO) during emissions testing
•Decreased fuel economy
•Rough engine idle or stalling
•Unusual exhaust odors (e.g., strong fuel smell)

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify malfunctioning components.
2
Inspect the gas cap for proper sealing; replace if it's cracked or damaged.
3
Check for leaks in the vacuum system, including hoses connected to the intake manifold.
4
Test the functionality of the catalytic converter with a backpressure gauge.
5
Examine the oxygen sensors for proper operation and check their wiring harnesses.
6
Verify that the fuel injectors are clean and functioning correctly.

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
•Multimeter
•Vacuum gauge
•Backpressure gauge
•Fuel injector cleaning kit

Parts Required

•Oxygen sensors (if faulty)
•Catalytic converter (if malfunctioning)
•Fuel injector cleaner

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify malfunctioning components.
2
Inspect the gas cap for proper sealing; replace if it's cracked or damaged.
3
Check for leaks in the vacuum system, including hoses connected to the intake manifold.
4
Test the functionality of the catalytic converter with a backpressure gauge.
5
Examine the oxygen sensors for proper operation and check their wiring harnesses.
6
Verify that the fuel injectors are clean and functioning correctly.

Solution

1. Preparation

Tools Required: OBD-II scanner, socket set, multimeter, vacuum gauge, backpressure gauge, fuel injector cleaner.
Ensure the vehicle is parked on a level surface and the engine is cool.

2. Address Check Engine Light Codes

Use the OBD-II scanner to retrieve error codes.
Write down any codes and research their meanings to determine specific issues.

3. Replace Faulty Components

Oxygen Sensors:
1. Disconnect the battery to ensure safety.
2. Remove the wiring harness from the oxygen sensor.
3. Use a socket to unscrew the old sensor and install the new one. Torque to manufacturer specifications.
Catalytic Converter:
1. Remove the exhaust system components leading to the catalytic converter.
2. Replace the catalytic converter if backpressure readings are above specifications.
3. Reassemble the exhaust system, ensuring all bolts are tightened to specification.

4. Clean Fuel Injectors

Use a fuel injector cleaning kit:
1. Disconnect the fuel rail supply line.
2. Attach the cleaning kit and follow the manufacturer’s instructions to clean the injectors.
3. Reconnect the fuel line and check for leaks.

5. Test and Reset System

After repairs, reconnect the battery and clear any error codes using the OBD-II scanner.
Start the engine and allow it to reach operating temperature before retesting the emissions.