What are the reasons for the 408 indicating an engine fault?
3 Answers
408 indicating an engine fault are: 1. Excessive engine carbon deposits; 2. Abnormal temperature sensor; 3. Poor gasoline quality; 4. Carbon deposits in the intake tract and piston top. Taking the 2020 408 as an example, it is a compact car with body dimensions of: length 4750mm, width 1820mm, height 1488mm, wheelbase 2730mm, and body weight 1325kg. The 2020 408 front suspension is a MacPherson independent suspension, the rear suspension is a torsion beam non-independent suspension, equipped with a 1.2t turbocharged engine, maximum horsepower is 136ps, maximum torque is 230nm, maximum power is 100kw, matched with a 6-speed dual-clutch transmission.
I've been driving for over a decade, and there are truly many reasons why the engine warning light comes on. The most common issues are with the ignition system, such as aging spark plugs or damaged ignition coils, which can cause misfires. Fuel system failures are also frequent, like clogged fuel injectors or insufficient fuel pump pressure, leading to inadequate fuel supply. Various sensor malfunctions can trigger it too, such as an oxygen sensor detecting abnormal air-fuel ratios or a faulty mass airflow sensor. If there's an issue with the emissions system, like a clogged catalytic converter, the light will also illuminate. Additionally, faults in the electronic control system or poor fuel quality can activate this warning. I must remind you: when the light comes on, don't push your luck – continuing to drive can seriously damage the engine. Getting the trouble codes read at a professional shop is the wisest move. Don't underestimate this warning; I've seen cases where ignoring it resulted in massive repair bills later. Regular maintenance checks on spark plugs and fuel lines can prevent many of these issues.
Once when I was driving my 408 out of town, the warning light suddenly came on, which gave me quite a scare. I asked a mechanic, who said it might be a sensor issue, such as an abnormal coolant temperature sensor or a dirty throttle body causing data errors. It could also be an exhaust system leak or a stuck EGR valve affecting emissions. A simple self-check method is to listen for abnormal engine sounds or notice if there's any shaking or increased fuel consumption. If you've just refueled, there might be impurities in the fuel clogging the filter. I remember that time, replacing an oxygen sensor solved the problem. When driving normally, avoid stomping on the accelerator too hard; maintaining a steady pace can reduce the chance of malfunctions. My advice is not to panic when the light comes on, but don't delay in addressing it either.
