my Toyota Highlander Third Generation (2014-2019) has a weird smell coming from the exhaust what's w...

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

4 min read

618 words

Problem Statement

Discover solutions for strange exhaust smells in Toyota Highlander 2014-2019. Follow our diagnostic steps and repair instructions for effective results.

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 inspecting the exhaust or coolant systems.

Symptoms

•Unusual odor from the exhaust
•Decreased engine performance or power
•Check engine light illuminated
•Increased fuel consumption
•Engine misfire or rough idle

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any stored trouble codes.
2
Inspect the exhaust system for visible leaks, damage, or corrosion.
3
Check the engine coolant level and inspect for any signs of coolant leaks.
4
Test the fuel system pressure to ensure it is within manufacturer specifications.
5
Inspect the air intake system for any obstructions or signs of contamination.
6
Check for oil leaks or burning oil by inspecting the engine oil level and condition.

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
•Wrench set
•Fuel pressure gauge
•Exhaust pipe cutter or saw

Parts Required

•Gaskets (exhaust and coolant)
•Replacement hoses (if required)
•New cylinder head gasket (if applicable)
•Fuel pump or fuel pressure regulator (if applicable)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any stored trouble codes.
2
Inspect the exhaust system for visible leaks, damage, or corrosion.
3
Check the engine coolant level and inspect for any signs of coolant leaks.
4
Test the fuel system pressure to ensure it is within manufacturer specifications.
5
Inspect the air intake system for any obstructions or signs of contamination.
6
Check for oil leaks or burning oil by inspecting the engine oil level and condition.

Solution

1. Preparation

Gather tools and parts needed.
Ensure the vehicle is parked on a level surface and the engine is cool.
Disconnect the battery before starting work on electrical systems.

2. Address Coolant Leak (if applicable)

Tools Required: Socket set, coolant, funnel
Steps:
1. Locate the source of the coolant leak (radiator, hoses, or head gasket).
2. If the radiator or hoses are leaking, replace the damaged components.
3. For a head gasket issue, drain the coolant and remove the cylinder head to replace the gasket.
4. Refill the cooling system with the appropriate type of coolant.

3. Repair Exhaust System

Tools Required: Wrench set, exhaust pipe cutter or saw, clamps, gaskets
Steps:
1. Inspect the exhaust system for damaged sections and note areas needing repair.
2. If necessary, cut out damaged sections and replace with new exhaust piping.
3. Install new gaskets and clamps to secure connections.
4. Ensure all connections are tight and check for leaks once the system is reassembled.

4. Address Fuel System Issues (if applicable)

Tools Required: Fuel pressure gauge, wrenches
Steps:
1. Connect a fuel pressure gauge to the fuel rail.
2. Turn on the ignition (do not start the engine) and check the pressure reading.
3. If the pressure is out of specification, replace the fuel pump or fuel pressure regulator as needed.

5. Address Oil Burn (if applicable)

Tools Required: Socket set, oil filter wrench, new oil and filter
Steps:
1. Inspect the engine oil level and condition.
2. If oil is low or dirty, perform an oil change, replacing the oil filter and using the manufacturer-recommended oil grade.
3. Inspect valve seals and piston rings if burning oil is persistent.