felixwolf8

Peugeot 407 Transmission Issues

Hi, I have a 2006 Peugeot 407 diesel with 123689 km on the clock. The engine warning light is on, and sometimes the transmission warning light as well. I scanned the error memory and it points to a faulty transmission oil temperature sensor. The gearbox sometimes goes into emergency mode, slips when shifting, and makes grinding noises. Could a low gearbox oil level cause this?

4 comment(s)

Hey, I had similar issues with my 407. By slipping I assume you mean the gears are not engaging properly? Also does the car rev when it happens? Low oil definitely could be the culprit. Worth checking the level first!

Yes, that's exactly it. The revs sometimes go up without proper gear engagement. How did you check the oil level?

It's a bit tricky to check the level yourself without the proper tools, it's not like a regular dipstick. Considering your symptoms, especially the grinding noises, I'd recommend taking it to a workshop to get it checked properly before you do more damage.

Thanks for the advice! Took it to a workshop, and you were right. It was the oil level, which was causing the temperature sensor to read incorrectly. Repair came to 365€, including a new sensor. All seems good now!

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