Having problems with your 1998 Citroen Xsara 1.6 ?
Ecu problem Ecu has return to default and the car is running only on3 cylinders
Dont think so ,i think more like a valve burnt out ,do a compression check first before playing with it ,remove all plugs and then check the compression
Repair Help & Product Troubleshooting for 1998 Citroen Xsara 1.6
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