AutoCodes – Scion – P0302 2005 Scion xB

P0302 2005 Scion xB Code - Cylinder 2 Misfire Detected

Quick Answer

When the engine misfires, high concentrations of hydrocarbons (HC) enter the exhaust gas. Common causes include Faulty spark plug (s), Faulty ignition coil (s), Clogged or faulty fuel injector (s). 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: P0302 2005 Scion xB indicates Cylinder 2 Misfire Detected.
Common causes: Common causes include Faulty spark plug (s), Faulty ignition coil (s), Clogged or faulty fuel injector (s).
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 4,977

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0302 2005 Scion xB Description

When the engine misfires, high concentrations of hydrocarbons (HC) enter the exhaust gas. Extremely high HC concentration levels can cause increases in exhaust emission levels. High concentrations of HC can also cause increases in the Three-Way Catalytic Converter (TWC) temperature, which may cause damage to the TWC. To prevent these increases in emissions and to limit the possibility of thermal damage, the ECM monitors the misfire rate. When the temperature of the TWC reaches the point of thermal degradation, the ECM blinks the MIL. To monitor misfires, the ECM uses both the Camshaft Position (CMP) sensor and the Crankshaft Position (CKP) sensor. The CMP sensor is used to identify any misfiring cylinders and the CKP 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 exceeds the threshold levels, and could cause emission deterioration, the ECM illuminates the MIL and sets a DTC.

OBDII Code P0302 2005 Scion xB - Cylinder 2 Misfire Detected - AutoCodes.com — P0302 2005 Scion xB Code - Cylinder 2 Misfire Detected

What does this mean?

What are the Possible Causes of the DTC P0302 2005 Scion xB?

Faulty spark plug (s)
Faulty ignition coil (s)
Clogged or faulty fuel injector (s)
Intake air leak
Fuel injectors harness is open or shorted
Fuel Injectors circuit poor electrical connection
Ignition coils harness is open or shorted
Ignition coils circuit poor electrical connection
Insufficient cylinders compression
Incorrect fuel pressure
Mass air flow meter
Engine coolant temperature sensor
Valve clearance
Valve timing
ECM

How to Fix the DTC P0302 2005 Scion xB?

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 P0302 code means that the cylinder 2 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 2. If the problem persists more tests needs to be done to diagnose problem, see "Possible Causes"

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0302 2005 Scion xB 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.

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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 P0302 2005 Scion xB Code

1. What are the common symptoms of OBDII code P0302 on a 2005 Scion xB?

- Common symptoms include engine misfires, rough idling, loss of power, and potential hesitation or jerking during acceleration.

2. What are the possible causes of a cylinder 2 misfire detected in a 2005 Scion xB?

- Possible causes include faulty ignition system components (spark plugs, ignition coils), a clogged fuel injector, vacuum leaks, low compression in cylinder 2, or a malfunctioning engine control module (ECM).

3. How can I diagnose the cause of a cylinder 2 misfire in my 2005 Scion xB?

- To diagnose a cylinder 2 misfire, you can perform a visual inspection of ignition components, check for vacuum leaks, conduct a compression test, use a scan tool to monitor live data, and perform a cylinder balance test.

4. Can a dirty fuel injector cause a cylinder 2 misfire in a 2005 Scion xB?

- Yes, a dirty or clogged fuel injector can cause a cylinder 2 misfire by disrupting the proper fuel delivery to the cylinder, resulting in an imbalance in the air-fuel mixture.

5. How do I repair a cylinder 2 misfire on my 2005 Scion xB?

- Repair options may include replacing faulty spark plugs, ignition coils, or fuel injectors, addressing vacuum leaks, performing a carbon cleaning service, or repairing any issues related to low compression in cylinder 2.

6. Is it safe to continue driving my 2005 Scion xB with OBDII code P0302 (Cylinder 2 Misfire Detected)?

- It is not recommended to drive your vehicle with a cylinder misfire as it can lead to further damage to the engine and other components. It's best to address the issue promptly.

7. Will resetting the OBDII code P0302 on my 2005 Scion xB make the issue go away?

- Resetting the code may temporarily turn off the check engine light, but it will not fix the underlying issue causing the cylinder 2 misfire. It's important to diagnose and repair the root cause of the problem.

8. Can a faulty ECM trigger OBDII code P0302 on a 2005 Scion xB?

- Yes, a malfunctioning Engine Control Module (ECM) can potentially cause a cylinder 2 misfire by not properly controlling the ignition timing or fuel delivery to the affected cylinder.

9. How much does it typically cost to repair a cylinder 2 misfire on a 2005 Scion xB?

- The cost of repairing a cylinder 2 misfire can vary depending on the specific cause of the issue. Costs may range from replacing spark plugs or ignition coils (relatively inexpensive) to more extensive repairs like addressing low compression or a faulty ECM (potentially more costly).

10. Can extreme weather conditions contribute to triggering OBDII code P0302 on a 2005 Scion xB?

- Extreme weather conditions, such as very cold temperatures affecting fuel atomization or heavy rain causing moisture-related issues in the ignition system, can potentially contribute to triggering a cylinder 2 misfire.