The dreaded glow plug light flashing on your dashboard, accompanied by a noticeable drop in performance? You might be facing the VW error code P0671. This code specifically points to a problem within the glow plug circuit for cylinder 1. Don’t panic! This article will guide you through understanding, diagnosing, and fixing this issue, whether you’re a seasoned mechanic or a car owner looking to save a trip to the workshop.

VW Error Code P0671 Glow Plug Circuit Diagram

What Does VW Error Code P0671 Mean?

P0671 indicates a malfunction in the electrical circuit controlling the glow plug for cylinder 1. Glow plugs are essential for starting diesel engines, especially in cold weather. They heat the combustion chamber, allowing the diesel fuel to ignite properly. A faulty glow plug circuit can lead to starting difficulties, rough idling, and reduced engine performance.

Why is My VW Showing Error Code P0671?

Several factors can trigger the P0671 code. The most common culprits include a faulty glow plug, damaged wiring in the glow plug circuit, a malfunctioning glow plug control module, or even a blown fuse. Identifying the root cause is crucial for effective repair.

VW Error Code P0671 Faulty Glow Plug

How to Diagnose VW Error Code P0671?

Diagnosing P0671 requires a systematic approach. Start by using an OBD-II scanner to confirm the code. Then, visually inspect the glow plug for cylinder 1 for any signs of damage. Next, check the wiring harness for any breaks, fraying, or corrosion. You can also use a multimeter to test the glow plug’s resistance and the circuit’s continuity. If these checks don’t reveal the problem, the glow plug control module might be at fault. Remember, proper diagnosis is half the battle won!

“A common mistake people make is replacing the glow plug without checking the wiring. Sometimes, a simple wire repair can save you time and money.” – John Miller, Automotive Electrical Engineer

How to Fix VW Error Code P0671?

Once you’ve identified the source of the problem, the fix can be relatively straightforward. If the glow plug is faulty, replace it with a new one. Damaged wiring should be repaired or replaced. If the glow plug control module is malfunctioning, it will need replacement. Finally, don’t forget to check and replace any blown fuses related to the glow plug circuit.

Step-by-Step Guide to Replacing a Glow Plug:

1. Disconnect the battery negative terminal.
2. Locate the glow plug for cylinder 1.
3. Carefully remove the electrical connector from the glow plug.
4. Use a glow plug socket to remove the faulty glow plug.
5. Install the new glow plug and tighten it to the manufacturer’s specified torque.
6. Reconnect the electrical connector.
7. Reconnect the battery negative terminal.
8. Clear the error code using an OBD-II scanner.

VW Error Code P0671 Glow Plug Replacement

“Always refer to your vehicle’s service manual for specific instructions and torque specifications. This will prevent any potential damage during the repair process.” – Maria Sanchez, Certified Automotive Technician

For those experiencing a similar issue with other cylinders, check out this helpful resource: vw error code p0670. This guide offers insights into related glow plug issues and provides further troubleshooting steps.

Conclusion: VW Error Code P0671 Resolved

VW error code P0671, though initially concerning, is often a manageable issue. By understanding the function of the glow plug circuit and following the diagnostic and repair steps outlined in this article, you can effectively address the problem and get your VW back on the road. Remember, a systematic approach is key to successful car repair. If you’re still experiencing difficulties, don’t hesitate to reach out to VCDSTool for assistance. We’re available at +1 (641) 206-8880 and our email address: vcdstool@gmail.com or you can visit our office at 6719 W 70th Ave, Arvada, CO 80003, USA.

FAQ

1. What is the cost of replacing a glow plug? Glow plugs typically cost between $15 and $30 each.
2. Can I drive my VW with error code P0671? While driving is possible, it’s not recommended. Continued driving can potentially damage other engine components.
3. How often should glow plugs be replaced? Glow plugs usually last between 60,000 and 100,000 miles.
4. Is P0671 a serious problem? While not immediately critical, ignoring P0671 can lead to more significant engine problems down the line.
5. What tools do I need to replace a glow plug? You’ll need an OBD-II scanner, a glow plug socket, and basic hand tools.
6. Can I replace the glow plug myself? With basic mechanical skills, replacing a glow plug is a DIY-friendly task.
7. What other problems can cause similar symptoms? Issues with the fuel injectors, fuel pump, or compression can also cause starting difficulties and rough idling.