c4user4

Thanks Paul, So after some time, I decided to change the Lambda sensors. Could you please let me know which one is the inlet sensor? The one in the top or the one in the bottom? (see the diagram below) Could you also guide me how to reach that sensor and take it out? thanks http://i68.tinypic.com/2vvwajn.png

Code reader shows "Lambda Sensor" error. What does it mean? Can I clean this sensor? How can I access it?

Thanks Paul. What is the cheapest code reader you would recommend for my engine? Citroen C4, 1.4 petrol (hatchback 2004)

Dears, In my Citroen C4, 1.4 petrol (hatchback 2004), just a few seconds after I start the car the message "depollution system faulty" appears on the screen and the engine management light stays on. For most part the car behaves normally, expect that now in low revs (for example behind a traffic light) it jitters and loses its power and some times even turns itself off. But when driving in speeds higher than 40 kph it is just fine. The probelm started two weeks ago. I had forgotten the car lights on which drained the battery. I called road assistance who jump-started the car by using a battery-boost. he told me to drive for 2 hours in gear two rev 4000 to charge the battery and I did. Two days later the "depollution system faulty" problem appeared. Seems that these two are related. Anyone can describe what is the problem with my car? Which part is faulty and how should I resolve it? Thanks you very much ps. my car screen looks like this: http://blogimg.goo.ne.jp/user_image/40/af/93d515c3f1f0f9b706e87257396fa429.jpg