friedrichmueller1
Peugeot 407 Automatic Transmission Issue
Summary of the thread
A 2008 Peugeot 407 experienced issues with the automatic transmission, including emergency mode activation, strange gear shifts, slippage, and grinding noises, accompanied by transmission and check engine lights. Diagnostics indicated an error related to radiator oil pressure, leading to suspicion of a faulty cable or plug connection. A similar case suggested checking the pressure sensor and wiring, which ultimately revealed a defective cable to the pressure sensor on the radiator. Repairing the cable resolved the issue, restoring the car's functionality.
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4 comment(s)
friedrichmueller1 (community.author)
Could you share the specific error codes you saw and the diagnostic steps you took to find the faulty pressure sensor? Were there any other symptoms besides what I mentioned?
emanuelsmith29
I can't recall the exact error codes, sorry. It was related to the gearbox oil temperature. I had a local workshop look at it after checking the basics myself. If you're not confident with that level of diagnostics, take it to a workshop. It sounds very similar to what I had.
friedrichmueller1 (community.author)
Following your suggestion and an inspection by a technician, the cable to the pressure sensor on the radiator was indeed defective, as I suspected. The repair, including replacing the cable and diagnostics, cost 95€. The car is now working as expected. Thanks for the help.
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PEUGEOT
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407
emanuelsmith29
I drive a Peugeot 407 and had a similar issue recently. Your symptoms sound familiar. For me, it was a faulty pressure sensor related to the oil cooler. The error codes initially pointed elsewhere, but that was it. Have you checked the sensor and wiring? Inspect the oil cooler for leaks or damage. Also, check the cooling fan is running properly.