why does my Toyota Corolla E170 (2013-2019) have an unusual smell coming from the engine

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

497 words

Problem Statement

Learn how to diagnose and fix unusual smells from the engine in a 2013-2019 Toyota Corolla E170. Step-by-step guide with symptoms and solutions.

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 working on any components to avoid burns

Symptoms

•Unpleasant odor resembling burning oil or plastic
•Smell of coolant indicating a possible leak
•Engine overheating warning light illuminated
•Visible smoke or steam from the engine area
•Fluid leaks under the vehicle
•Check engine light illuminated

Diagnostic Steps

1
Visual inspection of the engine bay for signs of leaks, burnt components, or damaged wiring
2
Check fluid levels of oil, coolant, and transmission fluid
3
Determine the nature of the smell (burning oil, coolant, plastic)
4
Use an OBD-II scanner to check for any stored trouble codes
5
Inspect all belts and hoses for signs of wear, damage, or melting
6
Examine the exhaust system for leaks or issues

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
•Belt tensioner tool
•Fluid containers
•Degreaser

Parts Required

•Engine oil or coolant (as needed)
•Replacement gaskets or seals
•New belts or hoses (if required)

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Diagnostic Steps

1
Visual inspection of the engine bay for signs of leaks, burnt components, or damaged wiring
2
Check fluid levels of oil, coolant, and transmission fluid
3
Determine the nature of the smell (burning oil, coolant, plastic)
4
Use an OBD-II scanner to check for any stored trouble codes
5
Inspect all belts and hoses for signs of wear, damage, or melting
6
Examine the exhaust system for leaks or issues

Solution

1. Preparation

Gather all required tools and parts before starting.
Ensure the engine is cool and disconnect the battery.

2. Addressing Fluid Leaks

Locate the Leak: Identify the source of any fluid leak (oil, coolant).
Repair or Replace Components:
- For oil leaks, replace gaskets or seals as necessary.
- For coolant leaks, replace damaged hoses or the radiator if necessary.
Tools Required: Socket set, torque wrench, fluid containers.

3. Replacing Damaged Belts or Hoses

Remove the Damaged Part:
- Loosen tensioner and remove serpentine belt if necessary.
- Detach problematic hoses.
Install New Components:
- Replace with OEM belts or hoses.
- Ensure proper routing and tension on the belt.
Tools Required: Belt tensioner tool, hose clamps.

4. Cleaning and Reassembly

Clean Affected Areas: Use a degreaser to clean oil or coolant residue from the engine.
Reassemble: Reattach any components removed during the repair.
Safety Warning: Ensure all surfaces are dry before starting the engine.