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P0303 2014 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 2014 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.
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Code Popularity 2,707
How popular is this code, among other codes? Low
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Table of contents Created and updated by William Orellana on Aug 25, 2022
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Code P0303 2014 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 2014 Toyota RAV4 - Cylinder 3 Misfire Detected - AutoCodes.com
P0303 2014 Toyota RAV4 Code - Cylinder 3 Misfire Detected
What does this mean?

What are the Possible Causes of the DTC P0303 2014 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 2014 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 2014 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 2014 Toyota RAV4 code?

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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 2014 Toyota RAV4 Code

What does OBDII code P0303 mean for a 2014 Toyota RAV4?

P0303 indicates a cylinder 3 misfire, meaning the engine is not properly firing on that specific cylinder.

What are the symptoms of code P0303 in a 2014 Toyota RAV4?

Common symptoms include rough idling, reduced engine performance, hesitation during acceleration, and the check engine light turning on.

What causes a cylinder 3 misfire in a 2014 Toyota RAV4?

Possible causes include a faulty spark plug, bad ignition coil, clogged fuel injector, vacuum leaks, or low engine compression in cylinder 3.

Can driving with code P0303 damage my 2014 Toyota RAV4?

Yes, prolonged driving with a misfire can cause damage to the catalytic converter and other engine components.

How do I fix code P0303 on my 2014 Toyota RAV4?

Start by inspecting and replacing the spark plug and ignition coil for cylinder 3. If the issue persists, check the fuel injector and engine compression.

How do I diagnose a P0303 misfire in cylinder 3?

Use an OBDII scanner to confirm the code, then perform tests on the spark plug, ignition coil, fuel injector, and cylinder compression.

Can a dirty fuel injector cause a P0303 code?

Yes, a clogged or malfunctioning fuel injector can prevent proper fuel delivery to cylinder 3, causing a misfire.

How much does it cost to repair code P0303 on a 2014 Toyota RAV4?

Costs vary depending on the cause, but replacing a spark plug or ignition coil could range from $100 to $300, while more complex repairs may cost more.

Can bad fuel cause a P0303 code in a 2014 Toyota RAV4?

Yes, contaminated or low-quality fuel can lead to misfires and trigger code P0303.

What tools do I need to troubleshoot code P0303 on my 2014 Toyota RAV4?

An OBDII scanner, spark plug socket, multimeter, and fuel pressure gauge are commonly used tools for diagnosing and fixing this code.

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