Guide To P2203 OBD Error Code Solutions

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Is the car engine not performing as per the expectations? Are you noticing affected fuel economy, increased emissions from the tailpipe and Check Engine Light illuminated on the dashboard? This can be an indication of the problem with the NOx sensor circuit of the vehicle, resulting in OBD code P2203 getting stored in the Powertrain Control Module (PCM).

NOx sensors have a great deal in common with wideband oxygen sensors, but typically have their own module that communicates with the vehicle ECM over a CAN bus. In most applications there will be two NOx sensors used; one at the turbocharger exhaust outlet and another downstream from the SCR catalyst. These two signals are then compared to determine conversion efficiency of the catalyst. It is also possible to have a single NOx sensor at the outlet of the SCR catalyst and utilize an ECM strategy to calculate engine-out NOx. Thus, when the PCM observes that the NOx sensor is sending higher voltage outputs than the normal set parameters for engine bank 1, OBD code P2203 gets stored.

What causes this problem with the NOx Sensor Circuit High Bank 1?

• Defective NOx sensor control circuit
• Broken, short or corroded wiring to the control circuits
• Poor electrical connections to the control circuit
• SCR controller programming error
• PCM failure

1. Engine Control Module - Dead cells in batteries can cause a failure in the engine control module. Many times, a battery is left in the rig long after a cell has died. This would affect the grounding in the car battery.
2. Powertrain Control Module - If there are some faults in the PCM, then it may throw off the timing and fuel settings of the engine, which can negatively affect the performance. A flawed PCM may cause the vehicle to experience a reduction in fuel efficiency, power as well as acceleration.
3. Exhaust Gas Recirculation Valve - Bad EGR valve can cause many performance issues. Common signs include engine performance issues like decreased power and acceleration, rough idle, and the Check Engine Light coming on. Thus, replace faulty EGR valve now!
4. Diesel Exhaust Fluid Pump - If the DEF pump will not function properly, it can cause increased emissions in the exhaust system and reduced the longevity of the filtration elements in the exhaust system. Thus, replace faulty pump immediately.
5. Electronic Control Unit - Do you know that the poor performance or unexplained drops in fuel economy or efficiency are often associated to onboard car computer problems, or defective ECU issues?
6. Diagnostic Tools - Use factory grade diagnostic tools to resolve OBD code P2203 error. Buy new diagnostic tools and equipment for us.
7. Fluid Pump Control Module - If the control module is faulty, the pump will not be able to work properly and will not be able to transfer fluid to the transmission and hydraulic system efficiently. Thus, replacements are in order.
8. Engine Coolant Temperature Sensor - One major symptom of defective engine coolant temperature sensor is an overheating car engine. This can also cause engine misfiring. Take care of your car engine coolant temperature sensor and replace it if needed.
9. Catalytic Converter - Catalytic converters at fault will lead to dropped fuel efficiency and performance along with increased emissions. Thus, replace faulty parts now!
10. Manifold Gasket Set - Check for faults in the intake gaskets as it will hamper the engine performance as well as the intake system and fuel delivery system as well. Thus, replace it now!
11. Air Filters - Check for clogged and damaged air filters and replace them immediately as it will hamper the air intake systems. Buy new filters now!
12. 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!
13. Diesel Exhaust Fluid Pump - If the DEF pump will not function properly, it can cause increased emissions in the exhaust system and reduced the longevity of the filtration elements in the exhaust system. Thus, replace faulty pump immediately.

Willing to know some common symptoms of OBD Code P2203? Your wish is our demand. Have a look at them below:

Common Symptoms

• Malfunction Indicator Lamp (MIL) illumination
• Rough engine with reduces response
• Black smoke from tailpipe
• Engine Stalling and not starting
• Increased fuel consumption

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.

• Replacement of MAF (Mass Air Flow) sensor
• Air Intake Pipe replacement
• Intake Manifold Seal/valve replacement
• Wiring/connections to the MAF (Mass Air Flow) sensor to be replaced
• NOx sensor repair or replacement
• NOx sensor faulty wiring and connector replacement

However, if you face any issue then we have stocked a wide range of best priced Diesel Exhaust Fluid, Diesel Particulate Filter, PCM, ECM, Catalytic Converter, NOx Sensor, Nox Sensor Harness, Intake Manifold, DOC Module, EGT Sensor and more to help you out in fixing your car.

It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P2203 code to be stored:

• Always check for sensor wiring and connectors to make sure they are intact, not frayed, broken, routed too close to ignition wires/coils, relays, motors, etc.
• Also inspect leakages in the air intake system and inspect the MAF sensor wires or film to see contaminations. Carefully clean the MAF and air intake mesh.
• Vacuum loss to the MAP sensor can also trigger this DTC. A low minimum air rate through the sensor bore may cause this DTC to set at idle or during deceleration. Thus, Inspect for any vacuum leaks downstream of the MAF sensor.
• Check real-time sensor values from the MAF sensor, O2 sensors, etc. using a diagnostic scan tool.
• Barometric Pressure (BARO) which is used to calculate the predicted MAF value is initially based on the MAP sensor at key ON. A high resistance on the ground circuit of the MAP sensor can cause this DTC to set.
• Perform an exhaust back pressure test to determine if the catalytic converter may be clogged. Clean/replace the components as required.

Common Mistakes When Diagnosing the P2203 Code

• Leakage in Intake manifold not checked properly
• Mass Air Flow (MAF) sensor replaced without proper examination
• Powertrain Control Module (PCM) failure not detected
• Not checking for faulty wiring and connections