Any one know these fault codes??

My car is still (after a year...new leads new plugs cleaned all sensors etc) misfiring like a bitch it now misfire really bad on petrol on start up like only on 4 cylinders. It also cuts out all the time on LPG now even after ive cleaned the whole lpg system. I did a diagnostic with my own scanner and it came up with

P1319 - i don't know what this is can anyone help??

P0134- O2 sensor CKT No activity (bank 1 sensor 1)

P0154- O2 Sensor CKT No activity (bank2 sensor 2)

I have no idea what these are and i wonder if the car even has them. I know there are o2 sensors in the exhaust system but can anyone help with these??


i've searched RAVE but it gives no clue to these fault codes.

Hackett said:

P1319 - i don't know what this is can anyone help??

P0134- O2 sensor CKT No activity (bank 1 sensor 1)

P0154- O2 Sensor CKT No activity (bank2 sensor 2)

I have no idea what these are and i wonder if the car even has them. I know there are o2 sensors in the exhaust system but can anyone help with these??

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Normal narrowband O2 (HEGO) sensors operate like switches, when they sense from the exhaust gas that the engine is running lean, they switch, when they then sense from the exhaust gas that the engine is running rich, they switch back and so on. The software in the ECU is written to gently ramp the fuelling rich then through stoich to lean and then back to rich again etc.etc. to get the HEGO's switching (the ECU detects the HEGO switching).

"No activity" would seem to imply that they are not switching which would indicate that either they are stuffed, or more likely the engine is running permanently so rich or so lean that the ECU can't ramp it back far enough to get it through stoich.

Of course, if the P38 has wide-band HEGO's then ignore everything I've said (again ).

Haven't got a clue what P1319 indicates ......

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

Fault code p1319: Misfire with Low/Empty FuelDrive cycle C:Signal out of range - above maximum

Hi guys thanks for replies. Do you think the O2 sensor fault could be due to my car being LPG because surely it would think its running really lean so would throw up a fault.

Hackett said:

Hi guys thanks for replies. Do you think the O2 sensor fault could be due to my car being LPG because surely it would think its running really lean so would throw up a fault.

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I woulnt have thought so, mine is lpg and i have no such codes and any how it shouldn't be running lean lpg or not!!

Hackett said:

Hi guys thanks for replies. Do you think the O2 sensor fault could be due to my car being LPG because surely it would think its running really lean so would throw up a fault.

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your sensor fault will no be down to your car running on lpg as if your lpg has been correctly fitted then it will be wired through your sensors and ecu etc and should run exactly the same on petrol or lpg

I've just been for a bit of a drive and those O2 sensor faults havn't come back but after i filled the petrol tank half full i still get the other fault.

Its ok though as its a good excuse to spend my sunday under my bonnet ....woohoo

dmtm2005 said:

your sensor fault will no be down to your car running on lpg as if your lpg has been correctly fitted then it will be wired through your sensors and ecu etc and should run exactly the same on petrol or lpg

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Hmmm..... Then the pigs start flying.

If it helps I had exactly the same 3 codes on my 4.6. The car ran like a dog on petrol and ran ok on LPG.

After spending shed loads of cash and being told it was down to the LPG system screwing up the O2 sensors by one garage. I replaced the MAF and the car has been fine ever since. I also had a faulty crank sensor which caused the car to cut out so since replacing both items its been perfect.