Guide To P2249 OBD Error Code Solutions

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If you feel sudden drop in the engine performance and continuous stalling and hard idles along with flashing of check engine lights on the dashboard, this may be an indication of OBD Code P2249 being stored in the PCM/ECM.

The upstream oxygen sensor for engine bank 1 has delivered a voltage signal that is not within the accepted parameters, causing the PCM to store a trouble code and possibly illuminate the service engine soon light. B2 denotes bank 2 of the engine block (typically the bank that does not contain the #1 cylinder). S1 tells you that the fault is found in sensor 1, or the upstream sensor (forward of the catalytic converter/s).

What causes this problem with the O2 Sensor Reference Voltage Circuit Low Bank 2 Sensor 1?

• Failed Bank 2 Sensor 1 O2 Sensor
• Short/open wiring problem
• High resistance and poor electrical connections
• ECU (Engine Control Unit) error

1. Engine Control Module - Want to know the most common reason behind the failure in the engine control module? Corrosion or damage because of moisture can cause ECM failure. Corrosion might enter the ECM through the wiring harness and moisture can enter by a failure in the seals in the ECM itself.
2. Engine Wiring Harness - Your car ECM would not operate properly if there are some cracks or break in the engine wiring harness. Corrosion as well as physical damage are the most common reasons why you should replace an engine wiring harness. Purchase high grade engine wiring harness online from Parts Avatar Canada.
3. Oxygen Sensor - The O2 sensor is mounted in the exhaust manifold to monitor how much unburned oxygen is in the exhaust as the exhaust exits the engine. Monitoring oxygen levels in the exhaust is a way of gauging the fuel mixture. Thus, replace faulty O2 sensor now!
4. Automatic Transmission Module - Faulty transmission module can cause problematic down shifts and up-shifts, leading to stalling while accelerating or slowing down. This can also hamper many transmission system parts. Thus replace it now!
5. Powertrain Control Module - The PCM makes the engine and transmission work in tandem. Any issue with the powertrain control module will cause major problems with the efficient running of the vehicle.
6. Fuel Injector - The fuel injectors are important component of the fuel delivery system that helps in proper utilization of the fuel entering the engine. This not only helps in taking care of the air to fuel ratios in the engine, helping the combustion process but also enhances the performance. Thus, replace faulty injector now!
7. Electronic Control Unit - If your vehicle fails to start for no apparent reason, this is also a good indicator that there can be some issues with the ECU. If you check the car battery, starter and other common electrical components, and the vehicle still does not start, a quirky electronic control unit should be the next logical thing to consider.
8. Diagnostic Tool - In order to fix these errors, you need few diagnostic tools to get your car problems pointed out easily. Our diagnostic tools collection will come handy to do so and resolve all your vehicle problems. Visit today!
9. Mass Air Flow Sensor - A faulty mass airflow sensor will cause problems similar to low compression or low vacuum, and will also show symptoms similar to when your vehicle has low fuel pressure from a faulty fuel pump. Thus, replace damaged/faulty MAF sensor today!
10. EGR Valve & Parts - Check for bad EGR system and parts that hamper the engine performance and can cause engine stalling and not starting along with rough engine idles. Replace faulty components now!
11. Throttle Body - Throttle body is a really important component that helps the air intake system and controls the air flow in the engine. Check for faulty parts and replace them now!
12. Manifold Absolute Pressure Sensor - Faulty MAP sensor affects the fuel efficiency and the engine performance and the intake systems as well. Replace faulty MAP sensor now!
13. Barometric Pressure Sensor - Damaged/faulty BPS will transmit wrong information to the PCM or nothing at all, affecting the air intake and the fuel delivery system and thus the engine performance. Replace faulty BPS now!
14. Throttle Position Sensor - If the TPS is damaged or faulty, it may cause loss of engine power and acceleration along with reduced fuel economy. Replace faulty sensor now

For us our customers are everything, and that’s why we will help you to diagnose P2249 code by mentioning some important symptoms below:

Common Symptoms

• Reduced fuel efficiency
• Affected engine performance and acceleration
• Rough starts and engine idles
• Malfunction Indicator Light (MIL) illumination

After you know the symptoms of your vehicle’s problem, it becomes easy to detect it and get started with solving it. So, next on our list is few common steps to correct this issue with your vehicle.

• Replace Bank 2 sensor 1 oxygen sensor
• Repair/replace open or short in the wiring and connections
• Bank 2 Sensor 1 fuse replacement
• Replacement of PCM/ECM

To do all this, you will need few high quality auto parts such as Oxygen Sensor, Exhaust Manifold, Ecm, Pcm, Exhaust Leak and so on. From where will you get them? From your local store? Well, why go there when you can order quality parts with us while sitting in the comfort of your home. So, just browse through our website and order your needed parts today.

Here are some steps which you should follow in order to diagnose this fault code:

• Install a scan tool in vehicles OBD-II port to check if P2249 is present or not.
• Freeze frame data and test drive to check if the code reappears under same conditions.
• If the Check Engine Light returns upon test, then the code is confirmed.
• Search technical service bulletins (TSB) in your vehicle information source. If you find one that matches the symptoms and code/s presented by the vehicle in question, it will very likely aid you in your diagnosis. TSB listings are compiled from thousands of successful repairs.
• Performs a visual inspection of wiring and bank 2 sensor 1 for any damage, breaks, or shorted wiring.
• If the wiring is okay, the sensor itself will be tested to confirm operation. Upstream O2 sensor data should fluctuate regularly between 1-millivolt (.100-volts) and 9-millivolts (.900-olts), if the engine is running efficiently.
• Check for the voltage of Bank 2 sensor 1 and make sure it is not excessively low. If low voltage is confirmed, bank 2 sensor 1 is faulty.
• A diagnostic of the ECU (Engine Control Unit) will be performed, if the voltage is not low and sensors are fine.

Common mistakes when diagnosing the P2249 code

P2249 is an uncommon code and following all diagnostic steps is important so nothing is overlooked. Oxygen sensors should be properly examined and replaced, if faulty. Always confirm low voltage for oxygen sensor bank 1 sensor 1 before any replacement is performed and avoid going to the ECU straightaway.