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Grand Cherokee Lmt.
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My 99 Jeep 4.7 Grand Cherokee is showing codes - P0420 and P1195. These are defined as "cataylst sys. efficiency below threshold bank 1" and "oxygen sensor heater circuit is bad".
Anone have advice or info on correcting these issues?
 

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The beast from Brazil
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I found a different meaning for the last code: P1195 O2 Sensor 1/1 (Bank 1, Sensor 1) Slow During Catalyst Monitor .
This to me looks as a bad bank 1 upstream O2 sensor. It could make the fuel mixture lean and cause the loss in power.
Because the PCM looks at the sensors 1 and 2 for the monitoring of the cat, a bad number 1 sensor could make it think that the cat performance is bad.
 

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Hello Guys, I have the same problem. There any Picture where this sensor are located? Thank You.
 
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