AutoCodes.com
Login with Google
AutoCodes – Toyota – P0303 2015 Toyota RAV4

P0303 2015 Toyota RAV4 Code - Cylinder 3 Misfire Detected

Quick Answer

When the engine misfires, high concentrations of Hydrocarbons (HC) enter the exhaust gas. Common causes include Intake air leak, Faulty spark plug #3, Faulty ignition coil #3. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0303 2015 Toyota RAV4 indicates Cylinder 3 Misfire Detected.
Common causes
Common causes include Intake air leak, Faulty spark plug #3, Faulty ignition coil #3.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Save to My Repairs Step-by-Step Diagnostic Guide My Repairs
AI answers can be wrong. Verify repairs with testing. Open full chat
Code Popularity 460
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Aug 25, 2022
💬 Need more help? Ask Coddy for instant answers — it's free!

Code P0303 2015 Toyota RAV4 Description

When the engine misfires, high concentrations of Hydrocarbons (HC) enter the exhaust gas. Extremely high hydrocarbon concentration levels can cause an increase in exhaust emission levels. Extremely high concentrations of hydrocarbons can also cause increases in the three-way catalytic converter temperature, which may cause damage to the three-way catalytic converter. To prevent this increase in emissions and to limit the possibility of thermal damage, the Engine Control Module (ECM) monitors the misfire count. When the temperature of the three-way catalytic converter reaches the point of thermal degradation, the ECM blinks the MIL. To monitor misfires, the ECM uses both the camshaft position sensor and the crankshaft position sensor. The camshaft position sensor is used to identify any misfiring cylinders and the crankshaft position sensor is used to measure variations in the crankshaft rotation speed. Misfires are counted when the crankshaft rotation speed variations exceed predetermined thresholds. If the misfire count exceeds the threshold levels and could cause emission control system performance deterioration, the ECM illuminates the MIL and stores a Diagnostic Trouble Code (DTC).
OBDII Code P0303 2015 Toyota RAV4 - Cylinder 3 Misfire Detected - AutoCodes.com
P0303 2015 Toyota RAV4 Code - Cylinder 3 Misfire Detected
What does this mean?

What are the Possible Causes of the DTC P0303 2015 Toyota RAV4?

  • Intake air leak
  • Faulty spark plug #3
  • Faulty ignition coil #3
  • Clogged or faulty fuel injector #3
  • Fuel injectors #3 harness is open or shorted
  • Fuel Injectors #3 circuit poor electrical connection
  • Ignition coils #3 harness is open or shorted
  • Ignition coils #3 circuit poor electrical connection
  • Incorrect Fuel pressure
  • Faulty Mass Air Flow (MAF) Sensor
  • Faulty Engine Control Module (ECM)
  • Faulty Engine Coolant Temperature (ECT) Sensor

How to Fix the DTC P0303 2015 Toyota RAV4?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

The P0303 code means that cylinder #3 is misfiring or is randomly misfiring. Start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder #3. If the problem persists more tests need to be done to diagnose the problem. See "Possible Causes" for the most common problems.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0303 2015 Toyota RAV4 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0303 2015 Toyota RAV4 code?

Need more information on how to fix the P0303 2015 Toyota RAV4 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0303 2015 Toyota RAV4 code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0303 2015 Toyota RAV4 Code

1. What are the common symptoms of OBDII code P0303 (Cylinder 3 Misfire Detected) in a 2015 Toyota RAV4?

- Common symptoms include rough idling, loss of power, engine vibrations, and potentially increased fuel consumption.

2. What are some possible causes of OBDII code P0303 in a 2015 Toyota RAV4?

- Potential causes can include faulty spark plugs, a malfunctioning ignition coil, vacuum leaks, fuel injector issues, or low compression in cylinder 3.

3. How can I diagnose the underlying issue causing code P0303 in my 2015 Toyota RAV4?

- Diagnosing the issue involves checking the spark plugs, ignition coil, fuel injector, and compression in cylinder 3. A professional diagnostic tool can help pinpoint the exact cause.

4. Can driving with code P0303 (Cylinder 3 Misfire Detected) in a 2015 Toyota RAV4 cause further damage?

- Continuing to drive with a misfire can potentially lead to damage to the catalytic converter, so it is recommended to address the issue promptly.

5. Is it safe to continue driving my 2015 Toyota RAV4 with OBDII code P0303 until I can have it repaired?

- It is not ideal to drive with a misfire as it can affect engine performance and lead to other problems. It's best to have the issue diagnosed and repaired as soon as possible.

6. How much does it typically cost to repair OBDII code P0303 in a 2015 Toyota RAV4?

- The cost of repairs can vary depending on the underlying cause. It could range from replacing spark plugs or an ignition coil to more extensive diagnostics and repairs.

7. Are there any DIY tips to try and fix OBDII code P0303 in my 2015 Toyota RAV4?

- DIY tips can include checking and replacing spark plugs, inspecting the ignition coil, looking for vacuum leaks, and ensuring proper fuel delivery to cylinder 3.

8. Can a simple reset of the OBDII system clear code P0303 in a 2015 Toyota RAV4?

- A simple reset may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to return once the system detects the misfire again.

9. How long does it take to repair OBDII code P0303 on a 2015 Toyota RAV4 at a mechanic?

- The repair time can vary depending on the cause of the misfire. It could take anywhere from half an hour for simple fixes to several hours for more complex issues.

10. Will fixing OBDII code P0303 improve the performance and fuel efficiency of my 2015 Toyota RAV4?

- Yes, addressing the misfire should improve engine performance, smooth out idling, and potentially restore lost fuel efficiency in your vehicle.

Discuss the causes and fixes for P0303 2015 Toyota RAV4 OBDII Code

Submit a New Comment

Code P0303 2015 Toyota RAV4 comments

No comments found for this page.

AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play