When your FIAT vehicle experiences a P1128 code, it is an indication that the closed loop fueling system has not been achieved. This code is triggered when the fuel control system fails to switch from open loop to closed loop control within the calibrated time. There are a variety of potential causes for FIAT P1128 code, ranging from faulty wiring to clogged fuel filters. It is important to identify and address the root cause of this code in order to ensure the safety and reliability of your vehicle.
Causes & Solutions of FIAT P1128 Code
| Cause | Solution |
|---|---|
| O2 SENSOR 1/1 WIRING OPEN OR SHORTED | Check wiring and replace if necessary. |
| RESTRICTED FUEL SUPPLY LINE | Clean or replace fuel supply line. |
| FUEL PUMP INLET STRAINER PLUGGED | Replace fuel pump inlet strainer. |
| FUEL FILTER/PRESSURE REGULATOR | Replace fuel filter and pressure regulator. |
O2 SENSOR 1/1 WIRING OPEN OR SHORTED
If the P1128 code is triggered as a result of faulty wiring, then the wiring harness must be checked and replaced if needed. This can be done by using a multimeter to check for continuity and voltage. If the wiring is damaged, then it will need to be replaced in order to prevent further issues from occurring.
RESTRICTED FUEL SUPPLY LINE
If there is a restriction in the fuel supply line, then it is likely that the code will be triggered. In this case, the fuel supply line must be cleaned or replaced in order to prevent the code from reoccurring. This should be done as soon as possible to avoid any further damage to the fuel system.
FUEL PUMP INLET STRAINER PLUGGED
If the fuel pump inlet strainer is plugged, then it must be replaced in order to prevent the code from reoccurring. It is important to replace the strainer as soon as possible in order to prevent any further damage to the fuel system.
FUEL FILTER/PRESSURE REGULATOR
If the fuel filter or pressure regulator is faulty, then it must be replaced in order to prevent the code from reoccurring. It is important to replace the filter and pressure regulator as soon as possible in order to prevent any further damage to the fuel system.
Conclusion
In conclusion, receiving the FIAT P1128 code is an indication that the closed loop fueling system has not been achieved. This code can be triggered as a result of a variety of causes, ranging from faulty wiring to clogged fuel filters. It is important to identify and address the root cause of this code in order to ensure the safety and reliability of your FIAT vehicle.
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