Peugeot 207 Manifold Pressure Sensor Issue

Your symptoms are familiar. I had a similar ordeal with my old Opel Astra, though it was a diesel. Check engine light, power loss, the whole shebang! In my case, it was a malfunctioning MAP sensor. It messed up the air-fuel mixture, causing all sorts of problems. Was the diagnostic tool specific about 'manifold pressure sensor', or did it just throw a general code?

The diagnostic tool specifically indicated the manifold pressure sensor, although it did also suggest examining the vacuum lines for potential leaks. Given your experience with the Astra, would you recommend focusing primarily on the sensor itself, or should I prioritize inspecting the vacuum lines first?

Considering the diagnostic tool pointed directly to the sensor, I would lean towards replacing it. However, a large vacuum leak can definitely throw off the sensor readings and even damage it over time, so check the lines as well. But honestly, unless you are very experienced, you might want to take it to a reputable workshop, because vacuum leaks can be tricky to trace. Replacing the sensor at home might also be risky. The repair ended up costing me 235€.

I appreciate your advice. After considering your recommendations and assessing my capabilities, I decided to consult with a trusted mechanic. They confirmed the sensor was faulty. After replacing the sensor, they also located and repaired a small vacuum leak that was contributing to the problem. The car is running smoothly again.