Diagnosing and Repairing VW Tiguan DPF Faults

In order to reduce harmful emissions, diesel engines require a Diesel Particulate Filter (DPF). However, what happens when it malfunctions?

In this blog post, we will answer this question and explain how we assisted one of our customers with this specific issue.

When one of our recent clients noticed the engine warning light illuminated on the dashboard of their VW Tiguan, they made the decision to bring their vehicle to our Galway garage for inspection. Despite no visible issues, our client was concerned about what the issue could be.

If the engine management light illuminates in your vehicle, it’s important to address the issue right away. This warning serves as an early indicator of potential problems, and ignoring it could result in costly repairs. To prevent such incidents, our team of VW experts is available here at Donnellan Auto Services to assist you with any engine management light concerns.

Our Findings

Our VW expert confirmed that the Tiguan’s engine management light lit up immediately upon starting the engine. In order to pinpoint the underlying cause of the problem, our mechanic performed a diagnostic test which generated the following error code:

• P154B 00 – Diesel Particulate Filter, difference pressure sensor faulty.

Our specialists view fault codes as road signs that guide them in tracking down the fault in order to resolve the problem.

As this was an issue with the DPF, it was important to resolve it quickly before it got any worse.

The failure of a DPF can lead to a variety of problems, including:

• Black smoke coming from your exhaust
• Failing your MOT emissions test
• Mechanical failure
• Your VW could enter into “limp mode” to protect the engine from damage.

Any DPF issues should not be ignored since they may lead to more expensive repairs later on.

There are various reasons that can result in DPF problems. So, our mechanic referred to the VW technical information to identify the underlying cause. Volkswagen offers mechanics a wealth of comprehensive specifications, instructions, and guidelines through this information to assist them in their work.

At Donnellan Auto Services, we have access to the same VW technical information that VW dealerships have. Our garage in Galway delivers a top-notch service similar to dealerships but with better-than-dealership value.

Diagnosing the Problem

When our VW technician ran a series of live data checks, they discovered that the pressure sensor on the DPF had “implausible readings”.

At Donnellan Auto Services, we follow a detailed 15-step diagnostic process to ensure that we can fix any issue. This approach helps to save our clients time, stress, and money. Additionally, our VW specialists use the latest technical information, including technical bulletins, to identify and resolve common issues like the DPF sensor problem.

Our VW experts were very thorough during their diagnosis, so they ensured it was not a wiring problem by testing the voltage of the wiring using an oscilloscope (the main VW dealer wouldn’t do this!)

Based on the results, it was determined that the wires were functioning correctly, leading to the conclusion that it was in fact the DPF sensor that was the source of the problem.

Fixing the Volkswagen Tiguan

After our VW specialist determined the reason why the engine management light was illuminating, we consulted our client and provided them with details of the work we believed needed to be carried out in order to resolve this issue. At Donnellan Auto Services, you have ultimate authority. We won’t start repairing your vehicle until we receive your consent to do so.

Once all parties agreed to the schedule of work, we proceeded to fit the Tiguan with a new DPF sensor. Our team of skilled VW technicians exclusively use authentic VW parts or high-quality equivalents to guarantee the optimal performance of your vehicle.

After replacing the faulty sensor, our expert performed a live data road test to confirm that the DPF was functioning properly. Our road testing verified that the Tiguan’s DPF was now working correctly and that the engine management light was no longer illuminated.

Our client was very happy with the swift and professional service we provided and was able to drive away, confident that the issues had been resolved.

In Summary

One of our clients recently brought their VW Tiguan to Donnellan Auto Services after noticing the engine management fault light was on. We conducted a comprehensive evaluation of the vehicle using VW technical information and our 15-step diagnostic process, and identified a fault with the DPF sensor.

We were fortunate to detect the problem with the VW early. We rectified the issue by replacing the DPF sensor with a high-quality VW replacement part.

Following a comprehensive road test, the client was handed back the keys to their vehicle, and they left our garage, confident in the knowledge that their VW Tiguan was now restored to its prime condition.

Are you noticing an illuminated engine management light on your VW? If left unattended, the issue may escalate. Get in touch with Donnellan Auto Services today for top-notch VW repair services.

Get your Volkswagen checked out by contacting us today.

Contact Us Online »