how to troubleshoot low oil pressure in my Toyota Highlander Third Generation (2014-2019)

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

4 min read

615 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 troubleshoot low oil pressure in your Toyota Highlander (2014-2019). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

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 opening the oil drain plug to avoid burns.

Symptoms

•Oil pressure warning light illuminated on the dashboard
•Engine noise, especially from valve lifters and bearings
•Poor engine performance or sluggish acceleration
•Oil leaks observed under the vehicle
•Increased engine temperature due to insufficient lubrication

Diagnostic Steps

1
Check the engine oil level using the dipstick; ensure it is within the recommended range.
2
Inspect for any visible oil leaks around the oil pan, oil filter, and oil pressure sending unit.
3
Use an OBD-II scanner to check for any related error codes that may indicate engine issues.
4
Test the oil pressure using an oil pressure gauge to determine the actual pressure reading.
5
Inspect the oil filter for proper installation and potential clogging.
6
Check the condition and viscosity of the engine oil; replace if dirty or if the wrong type is used.

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
•Oil pressure gauge
•Oil filter wrench
•Socket set
•Oil drain pan
•Funnel

Parts Required

•Engine oil (5W-20 or as specified)
•Oil filter
•Oil pressure sending unit

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Diagnostic Steps

1
Check the engine oil level using the dipstick; ensure it is within the recommended range.
2
Inspect for any visible oil leaks around the oil pan, oil filter, and oil pressure sending unit.
3
Use an OBD-II scanner to check for any related error codes that may indicate engine issues.
4
Test the oil pressure using an oil pressure gauge to determine the actual pressure reading.
5
Inspect the oil filter for proper installation and potential clogging.
6
Check the condition and viscosity of the engine oil; replace if dirty or if the wrong type is used.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface and the engine is cool.
Disconnect the battery to avoid electrical shorts.

2. Change Engine Oil and Filter

Tools Required: Oil filter wrench, socket set, oil drain pan, funnel.
Sub-steps:
1. Remove the oil drain plug and allow the old oil to drain completely into the oil pan.
2. Replace the oil drain plug and torque it to the manufacturer's specifications (typically around 20-25 ft-lbs).
3. Remove the old oil filter using an oil filter wrench.
4. Apply a thin layer of new oil to the rubber gasket of the new oil filter.
5. Install the new oil filter and tighten it according to specifications.
6. Refill the engine with new oil (5W-20 or as specified in the owner's manual) using a funnel.

3. Replace Oil Pressure Sending Unit

Tools Required: Socket set, wrench set.
Sub-steps:
1. Locate the oil pressure sending unit, typically found near the oil filter.
2. Disconnect the electrical connector from the sending unit.
3. Remove the sending unit using the appropriate socket or wrench.
4. Install the new oil pressure sending unit and torque it to specification.
5. Reconnect the electrical connector.

4. Recheck Oil Pressure

Tools Required: Oil pressure gauge.
Sub-steps:
1. Remove the oil pressure sending unit again and install an oil pressure gauge.
2. Start the engine and monitor the oil pressure gauge reading.
3. If the pressure is still low, further investigation into internal engine issues may be necessary.