how to fix a check engine light on Toyota Camry Eighth Generation (2018-present) that won't reset

Toyota Camry Eighth Generation (2018-present)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

471 words

Problem Statement

Learn how to fix the check engine light on a 2018-present Toyota Camry. Step-by-step guide with diagnostic steps and repair instructions.

Affected Component

Engine

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow engine to cool before performing any repairs to prevent burns.

Symptoms

•Check engine light illuminated
•Engine running rough or misfiring
•Decreased fuel efficiency
•Unusual engine noises
•Loss of power during acceleration

Diagnostic Steps

1
Scan the vehicle's onboard diagnostics using an OBD-II scanner to retrieve error codes.
2
Record any diagnostic trouble codes (DTCs) and research their meanings.
3
Inspect the vehicle's gas cap to ensure it is properly tightened or replace it if damaged.
4
Check for any visible signs of leaks in the vacuum hoses and intake manifold.
5
Inspect the ignition system components (spark plugs, coils) for wear or damage.
6
Examine the exhaust system for any blockages or damage.

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
•Screwdriver set

Parts Required

•New gas cap (if faulty)
•Spark plugs
•Ignition coils (if worn)

Related Faults

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Diagnostic Steps

1
Scan the vehicle's onboard diagnostics using an OBD-II scanner to retrieve error codes.
2
Record any diagnostic trouble codes (DTCs) and research their meanings.
3
Inspect the vehicle's gas cap to ensure it is properly tightened or replace it if damaged.
4
Check for any visible signs of leaks in the vacuum hoses and intake manifold.
5
Inspect the ignition system components (spark plugs, coils) for wear or damage.
6
Examine the exhaust system for any blockages or damage.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a flat surface and allow the engine to cool.
Disconnect the negative terminal of the battery to reset the ECU and prevent any electrical shorts.

2. Replace Faulty Components

Gas Cap Replacement:
1. Remove the old gas cap by turning it counterclockwise.
2. Install the new gas cap by turning it clockwise until it clicks.
Ignition System Repair:
1. Remove the engine cover if applicable using a socket set.
2. Disconnect the ignition coils by unplugging the electrical connectors.
3. Remove the bolts securing the ignition coils and pull them out.
4. Replace worn spark plugs with new ones, ensuring they are gapped correctly (typically 0.043 inches).
5. Reinstall ignition coils and secure them with bolts, then reconnect the electrical connectors.

3. Clear Diagnostic Trouble Codes

Reconnect the negative battery terminal after repairs.
Use the OBD-II scanner to clear any DTCs that were retrieved earlier.
Start the engine and let it idle for a few minutes to ensure the CEL does not reappear.