Code P4. 20 Catalyst System Efficiency 2. Nissan X Trail. Hi guys, I have a 2. Nissan X Trail with about 2. K. Few weeks ago the Service Engine Soon SES Light came on so I brought it to my mechanic who told me its code P4. The SES light came on again yesterday, i will go see the mechanic on Tuesday but I am wondering if you guys are familiar with this code and if so, any suggestion on the next course of action I obviously prefer not to have to spend any more, if I dont have to, but I also dont want to see the light coming back every now and again granted, it could be a different code this time around. The car is driving fine, otherwise, I dont notice anything unusual from the engine. Buying a Used Car Research and compare used cars and get the latest used car reviews, news, and videos at Autotrader. Looking for used Ford Mustang cars Find your ideal second hand used Ford Mustang cars from top dealers and private sellers in your area with PistonHeads Classifieds. Renault Pre Code Calculator' title='Renault Pre Code Calculator' />Suite une panne de batterie de ma voiture Clio 2 Campus, mon autoradio ma demand un code de scurit pour que celuici fonctionne nouveau. Pas de ch. Autoblog brings you automotive news, reviews and car pictures. Research and compare cars, find local dealers, calculate loan payments, find your cars book value and. Super Mario 63 Level Designer Games here. This Condo is located at Villas Sawyers Rdg, Festus, MO. Battle Of The Alamo Game. Villas Sawyers Rdg is in Festus, MO and in ZIP Code 63028. Villas Sawyers Rdg has 2 beds, 2 baths and was.