Mercedes G Wagon years to avoid

How we rated the best and worst G Wagon years

While evaluating the best and worst G Wagon years, our team stuck with reliable sources like NHTSA, IIHS, and others for vehicle reliability scores and details on safety ratings. We also considered driver reviews and ownership feedback left by other drivers on sites like Edmunds, KBB, and Consumer Reports.

Besides these, we also scoured through forum threads and databases of other driving safety organizations of authority like EuroNCAP, We’ve since rechecked every model year against NHTSA, and owners have filed very few complaints about any G-Wagon (9 at most, for the 2021), so the table is based on recalls and known problems rather than a complaint ranking. Here are the results:

Most common G Wagon problems

The G-Wagon is essentially a good car both mechanically and when it comes to the quality of materials used. It’s no wonder since it’s a premium-segment car, but it still has a few issues that are worth discussing. Among the worst problems of this model, we can point out the bothersome fuel leakage on the 2009 model.

1. Fuel delivery system leaks

One of the main low fuel pressure symptoms for the 2009’ G-Wagon is the fuel leak from the fuel lines and the fuel line quick connectors. In case of frontal damage to the car, these bad connections could even lead to a complete fuel pump stalling. However, the leaks are dangerous enough alone since they lead to reduced fuel pressure and even cause fire hazards.

The proximity of the fuel lines to the hot engine may result in a burning smell and fire hazards, so it’s crucial to have the fuel lines inspected if you’ve got your eye on the 2009’ G-Wagon, and to check that the fuel system recall (09V-453) was done.

2. Problem with the faulty crankshaft position sensor

One of the most common problems for the G-Class is the failing crankshaft position sensor. This sensor is crucial for proper engine timing and managing fuel injection and ignition. It measures the rotational speed of the crankshaft and accordingly submits information to the engine control unit which then uses it to control the fuel injectors accordingly.

If it fails on the G-Class, you’ll inevitably see some bad crankshaft position sensor symptoms like problems starting the vehicle, check engine light and poor or sluggish acceleration. It’s also a cause behind rough idling which is common for some G-Wagon models.

3. Faulty brake switch

The brake light switch problem is pretty common for G-Wagon drivers and it can fail prematurely. While this wasn’t a big deal mechanically, it caused a big issue since other drivers couldn’t see the braking lights engaging while braking.

It also affects the usage of the cruise control function, since you can’t disengage the cruise control function. The good thing is - this isn’t an expensive fix.

4. Engine oil leaks

Last but not least important is the problem with engine oil leaks. Not only is this dangerous since it reduces the lubrication of the engine parts, and it even serves a role in engine cooling. This problem was mostly present with high-performing variants like the G55 AMG and G63 AMG.

The 4.0-liter twin-turbo V8 has a problem with the oil feed line, and that’s the source of the leak. While it’s easy to fix since you mostly know the leak source location, it’s still a repair you’ll want done before you buy.

Worst G Wagon years to avoid

The famous G-Wagon had a predecessor with a similar body type and it was the W460 model. The “modern” G-Class started in 1990, and the design was pretty much the same up to the 2018 model year, so that’s considered the second generation of the famous SUV.

Because of this, we’ll break down the years to avoid into two generations and state the known issues of both to help you get the most reliable one out there. But first, the answer to the question you’ve been waiting to hear - what are the worst G Wagon years?

Honestly, owners have filed so few complaints about any G-Wagon that we can’t call any year truly bad. These are the years where we’d double-check the recall work before buying:

• 2004
• 2005
• 2009
• 2019

Also keep in mind that Mercedes only started selling the G-Class officially in the US with the 2002 model year, so anything older is a grey-market import.

Among all these, we’ll discuss the ones that had the most complaints and reliability issues through generations, as you will be able to see below:

First-generation G Wagon (2004-2005 and 2009 model years)

The biggest problem with the first-gen G-Wagon is the overall quality of the interior materials which was considered poor at the time. On top of that, there were some problems with door latches and linkages, as well as deteriorating power window buttons and door handles.

We’ve also seen a fair share of driver complaints about water leaking into the car’s passenger side due to windows and sunroof leaks. These were some of the main complaints about the older G-Wagon, but what really sets the 2004, 2005 and 2009 apart are their fuel system recalls (05V-378 and 09V-453).

While this may seem like a bad thing, look at it from the bright side - there were only a few reports about engine failures and transmission rebuilds that needed to be done on the first-gen G-Wagon. Perhaps that’s the reason why many consumers that can’t afford the latest model go for a used first-gen one, and as long as the recall work has been done, even the listed years can be fine.

Second-generation G Wagon (2019 model year)

Before the introduction of the proper second generation of the G-Wagon, there were four facelift versions. However, the second generation brought the much-needed interior refreshment as well as some other cosmetic changes. Along with those, there also came a few bad production years.

The 2019, the first year of the new G-Class, has 13 recalls with NHTSA, more than any other G-Wagon, along with oil leaks that were common for high-performing models. When it comes to the basic G-Wagon models (if there’s even such a thing), premature engine wear is the worst problem that could occur.

It often started with the signs of a bad crankshaft position sensor, and engine rebuilds can be extremely expensive. So, make sure to check the engine condition and compression before buying a used G-Wagon, Out of all the engines, the M 113 5.0-liter V8 of the G500 proved the be the most reliable, but it sadly wasn’t available for the second-gen model.