I wish everyone a pleasant forum. I have a 2001 model 206 1.4 Gasoline car. When my car idles, it experiences an overly rich mixture, a popping sound in the exhaust, and minor instability at idle. We can clearly see with the voltage values that the 1st oxygen sensor is drawing rich, both with the Car scann*rpro program on the OBD 2 device and with the Peugeot Planet 2000 program. After this, the car doesn't get any gas when taking off, it stalls, either stalls or continues to idle. The car doesn't report any faults. This stupidity goes away when it exceeds 4,000 rpm. Performance isn't perfect, but it improves. I can see it about 160-170 times on a long road trip. But city driving becomes a complete pain. It feels like someone is pulling the car from behind. There isn't a single part on the car that I haven't replaced due to this problem. - The list is as follows; 2 times, the first oxygen sensor was purchased. Bosch and NTK brand spark plugs, coils (NGK BRAND), 4 injectors (Magnetti Marelli), MAF sensor (original), canister valve (original PSA), and I also bought a throttle body. It was removed from a low-mileage vehicle. Everything you can think of was checked. The problem is this. The first oxygen sensor is unplugged, and the vehicle returns to normal. It's still spitting raw fuel, but it's more stable. Although the sensors we tried were purchased based on the chassis number, all three sensors, including the one on top, are having the same problem. The mechanics say that an electrical problem would directly send a fault to the ECU. But there's nothing wrong with the vehicle. I can't figure this out. I've spent a lot of money, but to no avail. I'm making a personal guess that there might be a ground in the oxygen sensor's electrical line, or that excessive current is causing the sensor to misfire. If this is the case, shouldn't a fault report be filed? I'm looking for your opinions.
tunakrf