P0174 Lagonda Special Six Diagnostic Trouble Code

P0174 Lagonda Special Six code definition:
P0174 is a kind of OBD-II Diagnostic P-Powertrain Diagnostic Trouble Code for Lagonda Special Six.

P0174 Lagonda Special Six 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 P0174 Lagonda Special Six diagnostic trouble code may include:
  • Blown fuse (if applicable)
  • Engine surge
  • Reduction in engine performance, especially at low RPM levels
  • The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Place of P0174 in engine

Possible Causes :

  • An air leak forward of the DPF will change the sensor readings resulting in the code
  • Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
  • Dirty air cleaner element Damaged DPF

Common Misdiagnoses

  1. Crankshaft Position Sensor Circuit Performance Problem
  2. TP Sensor Learn Not Complete Problem
  3. Low Coolant Circuit Problem
  4. Cruise Control System - Vehicle Accel Too High Problem
  5. Kick-Down Switch Failed Short Problem

Repair Processes :

If all testing has passed so far yet you still have the same code, check your scan tool and see if it can open and close the IMRC valve. Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector.

Process Tips

Diagnostic trouble code P0174 Lagonda Special Six 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 P0174 Lagonda Special Six.

Fortunately, P0174 Lagonda Special Six is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

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