P1143 Diagnostic Trouble Code

P1143 is a kind of OBD-II Diagnostic P-Powertrain Diagnostic Trouble Code.

It is considered generic because it applies to all makes and models of vehicles, although specific repair steps may be different depending on your car model.

Symptoms

Symptoms of a P1143 diagnostic trouble code may include:

Corroded or damaged connector
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Lack of power
Engine surge

Possible Causes :

Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
An air leak forward of the DPF will change the sensor readings resulting in the code
Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.

Repair Processes :

Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed. You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data. Find out what kind of system you have and verify that voltage to the fuel level sensor is present at the fuel pump wiring harness.

Process Tips

Diagnostic trouble code P1143 is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.

Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before P1143.

Fortunately, P1143 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1143 Trouble Code For Specific Cars

P1143 Innocenti C
P1143 Eagle Talon Incorrect Module Configuration
P1143 Mini Ii ASM Control Circuit Intermittent
P1143 Citroen 10 Hp Fan Control Circuit Malfunction
P1143 Fiat Duna Lamp Park Input Circuit Short To Battery
P1143 Davis Divan HO2S Heater Control Circuit Low (Bank 1 Sensor 1)
P1143 Nsu Ro Cylinder 11 Misfire Detected