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FORD FOCUS 2.0 Mk.1 ST170 (03/2002-01/2005) Type Approved Petrol Cat (fitting kit included)
OBD means On Board Diagnostics
Cars without OBD will only have a sensor fitted before the cat either in the exhaust manifold or the front pipe.
Cars with OBD will also have a sensor fitted in the rear of the cat or in the exhaust pipe after the cat