C0174 Saab 9.5 Ii Diagnostic Trouble Code

C0174 Saab 9.5 Ii code definition:
C0174 is a kind of OBD-II Diagnostic C-Chassis Diagnostic Trouble Code for Saab 9.5 Ii.

C0174 Saab 9.5 Ii or the Evaporative Emission Control System Incorrect Purge Flow is the set whenever the computer sees that there is a problem with the flow coming from the purge valve or the purge flow is not enough within the EVAP system. This is because the barometric pressure sensor is part of the MAF sensor. Sometimes, the MAF's sensing wire can accumulate and get covered with dirt, dust and/or oil residue, which can also lead to the error code.

Symptoms

Symptoms of a C0174 Saab 9.5 Ii diagnostic trouble code may include:
Place of C0174 in engine

Possible Causes :

  • Dirty air cleaner element Damaged DPF
  • A plugged converter will cause of host of driveability problems as well as set this code. A severely plugged converter will result in the inability to increase rpm when under load. Look for a code such as P0421 -- catalytic converter efficiency below threshold if the converter indicating a faulty converter.
  • Some aftermarket accessories and performance modifications

Common Misdiagnoses

  1. Vehicle Speed Output Circuit Problem
  2. Cruise Control Servo Indicates Low Problem
  3. A/C System High Pressure High Temperature Problem
  4. PCM Stack Overrun Problem
  5. Transmission Control Module Reprogrammable Memory Problem

Repair Processes :

If you find a related TSB, the information will often help in diagnosing the code in question as TSBs are crested from many thousands of repairs. 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 C0174 Saab 9.5 Ii 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 C0174 Saab 9.5 Ii.

Fortunately, C0174 Saab 9.5 Ii is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

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