Reviews of BERU glow plug

I bought the car in 2022 and replaced glow plugs and OEM unit with a beru one because It had faulty codes when scanned and a rough starting. It was good for two winters, now I'm having faulty codes against with rough start.

Cold starting the car below 10 degrees Celsius is a bit wobbly, I can see on the rpms and hear on the engine that it’s having a hard time the first 3 seconds. If I restart the engine on the same day or 1 minute after the first start, the engine starts nicely, the errors go from existent to non existent on ISTA. Scanned the car with ISTA, the errors every time are the 4 glow plugs. Injector corrections are good. Replaced all 4 glow plugs and the relay from BERU in 2023. The problem was the same. Replaced the relay again after finding the same 4 glow plug issues on ISTA with a Hitachi relay in 2024. The problem was the same. Replaced the relay with an OEM one in January 2025 and the problem still persisted. In the meantime I had to change the battery also but the issue wasn’t that. I have managed to find the Preheat function and tried that. Basically ISTA activates manually the glow plugs and does a check, the test performed was a success, no issues. The test was done with a cold engine, afterwards I started it and no wobbly effect was present.

In meinem EA288 im Bus hab ich einfach die Beru PSG007 verbaut und die tut einwandfrei.

Beru is the best.