Possible Causes

WARNING: This page is about a different car, the 2004 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

GOOD TRIP EQUAL TO ZERO
EXHAUST LEAK
RESISTANCE IN THE O2 SENSOR SIGNAL CIRCUIT
RESISTANCE IN THE (K4) SENSOR GROUND CIRCUIT
O2 SENSOR

Fig 1: Diagnosis Procedure - P1195, P1196 Slow During Catalyst Monitor (Test 1)
Courtesy of DAIMLERCHRYSLER CORP.

Fig 2: Diagnosis Procedure - P1195, P1196 Slow During Catalyst Monitor (Test 2 To 5)
Courtesy of DAIMLERCHRYSLER CORP.