Where is the reductant level sensor?

Reductant level sensor 3 is located at less than half range of the DEF tank level. The scan tool will display Active when the level sensors are in contact with reductant and Inactive when not in contact with reductant. An integrated temperature sensor monitors reductant temperature.

How do I fix my P203B code?

How To Correct P203B Reductant Level Sensor Circuit Range/Performance

1. Repair or replace the temperature sensor.
2. Repair or replace ECM module.

What is a reductant injector?

The reductant injector is used to reduce emissions gases exiting the exhaust by injecting either air or chemicals depending on the usage and vehicle. When the ECU detects the fault in the reductant injector circuit, it will set the P2047 code and the Check Engine Light will be displayed on the dashboard.

Will low DEF set a fault code?

No no, a low level will not trigger check engine light! It will however give you countdown to no start. Bad/diluted DEF will give you the errors above, and sometimes a failing NOx sensor. Might want to check the tip of the metering valve into the exhaust.

What is P203B?

P203B OBD-II: Reductant Level Sensor Circuit Range/Performance. What does OBD-II fault code P203B mean? OBD-II Code Diagnostic Trouble Code is defined as a Reductant Level Sensor Circuit Range/Performance. Diesel Exhaust Fluid (DEF) is used to assist in converting leftover exhaust particles to harmless gases.

What is a reductant tank heater?

OBD-II Code P202B is defined as a Reductant Tank Heater Control Circuit Low. Newer diesel vehicles have a Diesel Particulate Filter to reduce soot emissions. This filter uses DEF Fluid to assist in the burning off soot. The Reductant Tank Heater heats the DEF Fluid to the temperature is more efficient.

What does reductant pressure too low mean?

OBD-II Code Powertrain Control Module (PCM) failure is defined as a Reductant Pressure Too Low. Diesel Exhaust Fluid (DEF) is used to assist in converting leftover exhaust particles to harmless gases. In order to burn off those particles, the temperature of the exhaust system needs to increase.

What is a P2048 code?

The P2048 code is a generic powertrain code related to the exhaust system. In this case, it means that the reductant injector circuit located on bank 1 unit 1 of the exhaust has a low circuit.

How do I reset my DEF light?

To reset the DEF light on a Mercedes Sprinter, simply refuel the diesel exhaust fluid (Adblue) tank and start the car again. The light should turn off, but if it doesn’t you might have to use an OBD2 scanner or disconnect the battery to reset the ECU.

How do I fix code P203B?

How To Correct P203B Reductant Level Sensor Circuit Range/Performance

1. Repair or replace the Exhaust system components.
2. Repair or replace catalytic converter.

What is a reductant heater a control performance?

The reductant heater is a component that is used to prevent diesel exhaust fluid from freezing or crystallizing in low temperatures. It is usually located in the diesel exhaust fluid filter reservoir and/or the reductant injector supply hose(s).

What does a reductant tank do?

The reductant control module monitors the reductant temperature sensor located within the Emission Reduction Fluid Tank in order to determine if reductant temperature is below its freeze point. If the control module determines that the reductant may be frozen, it energizes the reductant heaters.

How does a reductant heater work?

The reductant heater and sender assembly level sensor incorporates four stainless steel electrodes. Three electrodes arranged vertically provide a high, middle, and low level signal and the fourth electrode runs the length of the level sensor and acts as a ground. The reductant is a good conductor of electricity.

How do you fix reductant pressure too low?

How To Correct Reductant Pressure Too Low Issue

1. You must fix the defective reductant pump.
2. Make sure to mend the faulty reductant injector.
3. It is essential to restore the flawed reductant purge valve.
4. Repair or replace the quirky reductant pressure line.
5. Rehabilitate the defaults in the reductant pressure sensor.

How does a DEF injector work?

Small quantities of diesel exhaust fluid (DEF) are injected into the exhaust upstream of a catalyst, where it vaporizes and decomposes to form ammonia and carbon dioxide. The ammonia (NH3) is the desired product which in conjunction to the SCR catalyst, converts the NOx to harmless nitrogen (N2) and water (H2O).