why does my Toyota Corolla E170 (2013-2019) have a weird smell coming from exhaust

Toyota Corolla E170 (2013-2019)

Error Codes

3-5 hours

Time

medium

Difficulty

medium

Severity

3 min read

566 words

Problem Statement

Learn how to diagnose and fix the weird smell from the exhaust in your Toyota Corolla E170. Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Exhaust System

Estimated Time

3-5 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical components.
•Allow the engine to cool before working on the exhaust system.

Symptoms

•Unusual odor from the exhaust
•Check engine light illuminated
•Decreased fuel efficiency
•Engine misfire or rough idle
•Increased emissions

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any related issues.
2
Inspect the exhaust system visually for signs of leaks or damage.
3
Check the engine oil level and condition to rule out contamination.
4
Examine the fuel system for leaks or signs of poor fuel quality.
5
Test the coolant level and look for signs of coolant mixing with oil.
6
Inspect the spark plugs for signs of abnormal wear or fouling.

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
•Jack stands
•Socket set
•Torque wrench
•Spark plug socket
•Ratchet
•Screwdrivers

Parts Required

•Catalytic converter (if damaged)
•Spark plugs
•Fuel injectors (if faulty)
•Head gasket (if needed)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any related issues.
2
Inspect the exhaust system visually for signs of leaks or damage.
3
Check the engine oil level and condition to rule out contamination.
4
Examine the fuel system for leaks or signs of poor fuel quality.
5
Test the coolant level and look for signs of coolant mixing with oil.
6
Inspect the spark plugs for signs of abnormal wear or fouling.

Solution

1. Preparation

Ensure the vehicle is parked on a level surface, and the engine is cool.
Gather necessary tools and parts.

2. Addressing Exhaust System Issues

Inspect the Exhaust System:
- Check for any visible leaks or damage in the exhaust pipes, muffler, and catalytic converter.
- If a leak is found, replace the affected section.
Replace the Catalytic Converter (if necessary):
- Disconnect the battery.
- Raise the vehicle with jack stands for access.
- Remove the exhaust hangers and bolts securing the catalytic converter.
- Install a new catalytic converter, ensuring proper alignment and secure all bolts to the manufacturer's torque specifications.

3. Fixing Engine Issues

Replace Spark Plugs:
- Remove the ignition coils by disconnecting the harness and unscrewing the bolts.
- Extract the old spark plugs using a spark plug socket and ratchet.
- Inspect the spark plug wells for oil or debris.
- Install new spark plugs with the recommended gap and torque to specifications.
Check and Replace Fuel Injectors (if needed):
- Remove the intake manifold if necessary to access the fuel rail.
- Disconnect the fuel lines and electrical connectors from the injectors.
- Remove the old injectors and install new ones, ensuring proper sealing and connection.

4. Coolant System Inspection

Check for Coolant Leaks:
- Inspect the radiator and hoses for leaks.
- If coolant is found in the oil, replace the head gasket.
- Drain the oil and coolant, replace the gasket, and refill with fresh fluids.