Once you have diagnosed the faulty component, here is the repair path.
Here is the surprising truth: You may not notice any driving issues at first. Unlike a misfire or a fuel injection fault, a single failed glow plug on a modern BlueHDi engine often does not produce immediate, violent symptoms.
However, if you ignore the code, you will eventually experience: b173d peugeot
Depending on the diagnosis, the solution will usually be one of the following:
You do not need a mechanic for the diagnostic phase. A basic digital multimeter ($20) and an OBD2 scanner are enough. Once you have diagnosed the faulty component, here
Step 1: Clear the code and retest. Erase the B173D code, start the engine on a cold morning, and re-scan. If it returns immediately, the fault is permanent.
Step 2: Visual inspection. Open the hood. Locate the glow plug for Cylinder 4. Look for: Step 3: The Resistance Test (Disconnect the harness)
Step 3: The Resistance Test (Disconnect the harness). Unplug the electrical connector from the glow plug control unit and test each glow plug directly at the unit's connector pins. You need the pinout diagram for your specific Peugeot engine (DV6 or DW10). For cylinder 4, you should see approximately 0.6 to 1.2 Ohms.
Step 4: The Harness Test. If the glow plug tests fine (0.6 Ohms), you need to test the wire from the control unit to the plug. Disconnect both ends and use your multimeter on continuity mode. A beep means the wire is good. No beep means the wire is broken.
Step 5: Swap test. If possible, swap the Cylinder 4 glow plug with Cylinder 1. Clear the codes and restart.