Hi
P0134 - 02 sensor circuit no activity detected (bank 1 sensor 1)
This code refers to the front oxygen sensor on Bank 1. Basically the oxygen sensor is inactive. Here's why:
The powertrain control module (PCM) provides a baseline voltage of about 450 mV on the oxygen sensor signal circuit. When cold, the PCM detects the the internal resistance of the sensor is high. As the sensor warms up the resistance is lowered and it starts producing voltage based on the oxygen content in the exhaust. When the PCM determines that the time it took for the sensor to warm up is greater than one minute or that the voltage is inactive (not reading outside 391-491 mV it views the sensor as inactive or open and sets the P0134 code.
Potential Symptoms one or more of the following may occur:
Check engine light illumination
Poorly running/engine missing
Blowing black smoke
Poor fuel economy
Dying, stuttering
Causes: a code P0134 may mean that one or more of the following has happened:
Bad O2 (oxygen) sensor
Bad heater circuit in the O2 sensor
Wiring or connector to the sensor frayed / broken
Blown heater circuit fuse
Holes in the exhaust system
PCM failure
Possible Solutions: The most common fix is to replace the oxygen sensor. But that doesn't rule out the possibility of:
Rusted exhaust pipe
Inspect wiring & connector(s) for problems
Excessive amperage blowing heater fuse (still requires replacement of sensor but also replacement of blown fuse).
Replace PCM (only as last resort after all other possibilities are covered.
P0154 - Front H02 sensor. RH bank open circuit.
Both P0154 and P1153 indicate a problem with your bank 2, sensor 1 o2 sensor. It's not operating like the PCM thinks it should, and so sets those two codes. It's likely a sensor or the associated wiring, connectors to the sensor. The P0420 indicates a bad catalyst on one bank, but if your o2 sensor is over fueling the vehicle, that extra fuel may be causing the catalyst's temperature to increase beyond the allowable efficiency threshold and causing the P0420. So get the 2,1 sensor looked at, or just replace it (It's a good bet it's the sensor, although not ruling out the harness). Then see if the 0420 stays away and go from there.
P1319 - misfire detected at low fuel level. Poss fuel pump pressure, injector, check coil. (water in fuel?)
Hope this helps