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How to Solve EGR System Issue in Volkswagen Golf 

The Volkswagen Golf is one of the German brand’s iconic models. It has been around for nearly fifty years, and it probably will stay in the game for a long time, the way things are going. But even though the model has been around for almost half a century, it still maintains its status as one of the most liked German compact cars. 

We can give you one good reason why Golf enjoys such a position – its reliability. 

No car has ever made it through its first generation if it wasn’t liked by the people. So, if a vehicle makes it through to half a century, you know it is a highly reliable piece of machinery.  

But does that mean, it won’t ever give you problems? Well, the short answer to that is “it’s unlikely”. That’s because cars are complex machines, with over 30,000 parts. The mixture of both mechanical and electronic components makes it hard for vehicles, especially modern ones, to maintain reliability. 

Unfortunately, our client got a firsthand experience of a Volkswagen Golf reliability issue. He drove the compact passenger car into the Donnellans garage and complained about a few issues in his vehicle.  

Our Golf technicians asked for a bit more detail and learned that the client’s Volkswagen Golf was repeatedly going into limp mode and the Engine Management Light (EML) was on in the dash. By now the issue didn’t seem too major. But our client offered another piece of information that intrigued our VW technician. 

When the client switched off the car and turned it back on, the limp mode would go away temporarily. But returned soon after, when the issue returned.    

Our senior Volkswagen technician understood our client’s complaints and started to formulate a mental plan to tackle the Golf’s issues. 

Faults Found 

The first step was to confirm all the client’s troubles and ensure there were no hidden faults. Our Golf specialist inspected the car, took it for a test drive, and checked the limp mode functionality. Fortunately, everything seemed to be working fine except for the fault described by our client.  

The car was indeed going out of limp mode when the switch was turned off and on again. 

The only thing left now was to initiate the 15-step diagnostic procedure followed by all the technicians at Donnellans.  

Diagnostic Procedure   

The 15-step diagnostic procedure helps our technicians go through each and every aspect of the problem, ensuring they don’t miss anything along the way. The process is detailed and thorough, which always leads to the solution one way or the other.  

Our Golf technician used the same efficient procedure to diagnose the problems found in the client’s car.  

The fault scan was the first item on the diagnostic list and our technician started with that almost immediately. The engine management light was prompting our VW specialist to perform an error code scan and find the problem area. 

The search turned up the relevant fault code: 

  • P0403 00 – This particular code indicates a problem in the EGR system. The ODIS diagnostic tool shows EGR Valve (N18) Malfunction on the screen. 

The EGR valve failure malfunction usually turns up a sub-fault, which is related to the parent issue. There are several components within the EGR unit and a different error code turns up for each malfunction. The client had an issue with the EGR valve that showed the P0403 00 fault code. But the ECU could easily have shown one of the following codes to specify the exact problem: 

-P046C 00: EGR Sensor 1 – Implausible Signal 

-P0407 00: EGR Sensor 2 – Signal Too Low

-P0401 00: EGR System – Insufficient Flow 

The client’s car had P0401 00 also logged in on the scan. As a result, our VW technician understood that there was a gas recirculation issue in the client’s Volkswagen Golf. 

The next step was to perform a visual check to try and find the root cause of the problem. So, our VW technician proceeded to inspect the EGR valve and found that there was a lot of soot build-up in the system. The inlet and the outlet pipes were contaminated and were in dire need of a cleanup. 

This also meant that the exhaust gases were leaking through the protective layer of gaskets and roller. The natural wear and tear had led to such a problem. 

We had a clear picture in front of us now, but we had to confirm the fault further by performing live data checks. 

Therefore, our Golf technician used the ODIS software to look for irregularities in the data. The readings from the system are compared with the specification readings and if there is an outlier, the issue is caught red-handed. 

However, with the client’s 2010 Volkswagen Golf, the manipulation of the EGR system through the software was not having any effect on the live data. That does not usually happen and as a result of this finding, something else turned up on the scan.

Our Golf specialist proceeded to check the wiring to confirm that no wiring or electrical issue was promoting the valve failure. Luckily, all was fine in that area, the only issue now was that the EGR valve was not responding to the electric signals. 

The only reason for that is if there is an internal failure with the EGR valve. 

All that was left now was to initiate the repair and hand over the car to the owner. 

The Solution

Our senior Volkswagen technician began the repair by removing the entire EGR valve unit. The component was faulty and could not be trusted to perform any further. We discarded the valve and cleaned up the soot around the area. This was done to ensure the new EGR valve would not choke up too soon. 

Thereafter, the VW technician installed a brand-new EGR valve to the 2010 Golf, tidied up the area, and went back to the ODIS software to check for faults. As expected, the system registered no new fault codes, and the EML light was also turned off on the dash. 

We took the car for a test drive and confirmed that the Golf wasn’t going into limp mode anymore. 

Our VW technician handed over the keys back to our client, who tried the car himself. The client approved the repair and left our garage as a satisfied customer.  

Summary 

It is never a good sight when the Check Engine Light illuminates in the dash. But what’s even worse is when a fault comes up along with it as well. 

One of our clients witnessed this recently in his 2010 Volkswagen Golf. A worried client drove into our garage and complained that his vehicle was repeatedly going into limp mode. The issue was affecting his car’s performance and causing unnecessary annoyance.

Our expert VW technician took the case and performed a detailed diagnosis, using the 15-step diagnostic procedure. As a result of the diagnostic process and the specialists’ skills, the problem was solved and the car was handed back to the client in record time. 

That is the level of skill and professionalism you can find at Donnellans. Our team of VW technicians is efficient, professional, and knowledgeable on all issues concerning vehicles.    

If you want to experience our exemplary service and get the best value for your money, you can call us at 091 792474 and learn more about Donnellans from our staff. 

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