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Example: P0120
P3990 Mercedes S 560 engine code seems a kind of powertrain problem, we try to show one by one the meaning and the solution.
Brief explanation of the P3990 Mercedes S 560 code and definition of P3990 Mercedes S 560 is the bottom side.
| p |
Powertrain Code Problem is related engine, transmission and emissions systems. |
| 3 | SAE - Generic |
| 9 | Fuel And Air Metering (Injector Circuit Malfunctions Only) |
| 9 | Crankshaft Position Sensor Circuit Performance |
| 0 | Transmission Engaged At High Throttle Angle |
SAE - Generic codes, which have a '0' as their second digit to indicate they are common to all makes and models of vehicles. These are the codes that are required for basic emissions fault diagnosis.
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How To Fix P3990 Mercedes S 560 ?
The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. |
The original multi-displacement system turned off opposite pairs of cylinders, allowing the engine to have three different configurations and displacements. P3990 code had an elaborate diagnostics procedure, including showing engine trouble codes on the air conditionning display. However, the system was troublesome, misunderstood by customers, and a rash of unpredictable failures led to the technology being quickly retired. When you see P3990 Mercedes S 560 engine fault code on your engine code reader this description will help you.
| P Codes | List of all Powertrain codes. |
Final Step: In the definitions listed below, there is a test drive recommended after you've completed any repairs to see if the condition is fixed. Before you take a test drive after a repair, always erase the P Code(s) first. This will turn the check engine light off and then you will know if the check engine light returns, you've got further diagnostics to complete.
BE CAREFUL !
This engine code information is presented for information purposes only. This is not intended as repair advice and we are not responsible for any actions you take on any vehicle.
