jiginc Posted August 14, 2009 Share Posted August 14, 2009 Hi, Help please with a D2 V8 problem. Had the engine on a Crypton CODEx analyser yesterday and it reported fault code P0134 O2 Sensor no activity detected (Bank 1 Sensor 1) . However when I have checked it on a OBD II simple system same fault code but when looking at the data it gives; O2 Sensor 1 , Bank 1 output 0.515v O2 Sensor 1 Bank 2 output 0.565v Are these not the signals it says have no activity? These voltages vary as the engine is used. Also the information says at start up it’s running open loop and it changes to closed loop which seems to indicate that it must be getting a signal from the Lambdas or it would stay on open loop. Also the problem I am having lumpy running on LPG between 1000rpm and 2000rpm does not happen when on open loop. jiginc Quote Link to comment Share on other sites More sharing options...
marty1a Posted August 15, 2009 Share Posted August 15, 2009 Hi, Help please with a D2 V8 problem. Had the engine on a Crypton CODEx analyser yesterday and it reported fault code P0134 O2 Sensor no activity detected (Bank 1 Sensor 1) . However when I have checked it on a OBD II simple system same fault code but when looking at the data it gives; O2 Sensor 1 , Bank 1 output 0.515v O2 Sensor 1 Bank 2 output 0.565v Are these not the signals it says have no activity? These voltages vary as the engine is used. Also the information says at start up it’s running open loop and it changes to closed loop which seems to indicate that it must be getting a signal from the Lambdas or it would stay on open loop. Also the problem I am having lumpy running on LPG between 1000rpm and 2000rpm does not happen when on open loop. jiginc Check your wires going to the malfunctioning o2 sensor it most likely to be a ground issue Best advice is to check and clean all the connections hth martin Quote Link to comment Share on other sites More sharing options...
jiginc Posted August 17, 2009 Author Share Posted August 17, 2009 Check your wires going to the malfunctioning o2 sensor it most likely to be a ground issue Best advice is to check and clean all the connections hth martin Thanks for that martin I have checked the plugs and the leads and all seems to be OK. What I do not undeerstand is why the fault code says it's malfunctioning but the data reads an output. and it switches to closed loop when a faulty Lambda would keep it in open loop!!!!!!!!!!!!! jiginc Quote Link to comment Share on other sites More sharing options...
vougese39 Posted August 17, 2009 Share Posted August 17, 2009 some obd2 multi code readers will read codes but do somtimes miss other faults which the original factory testers will see do you have pre and post oxygen sensors? Quote Link to comment Share on other sites More sharing options...
jiginc Posted August 18, 2009 Author Share Posted August 18, 2009 some obd2 multi code readers will read codes but do somtimes miss other faults which the original factory testers will see do you have pre and post oxygen sensors? Thanks, mine only has pre O2 sensors. Quote Link to comment Share on other sites More sharing options...
vougese39 Posted August 18, 2009 Share Posted August 18, 2009 do they switch voltage smothley or eratticaly Quote Link to comment Share on other sites More sharing options...
marty1a Posted August 19, 2009 Share Posted August 19, 2009 do they switch voltage smothley or eratticaly Rover meaning is: P0134 = "Front sensor LH bank open circuit" "O2 sensor circuit no activity detected sensor 1" Is the sensor faulty?? Martin Quote Link to comment Share on other sites More sharing options...
jiginc Posted August 19, 2009 Author Share Posted August 19, 2009 Rover meaning is: P0134 = "Front sensor LH bank open circuit" "O2 sensor circuit no activity detected sensor 1" Is the sensor faulty?? Martin Hi, Both sensors are new and OEM parts. Not that that means they are 100%. thanks Quote Link to comment Share on other sites More sharing options...
marty1a Posted August 20, 2009 Share Posted August 20, 2009 Swap the sensors over / clear code(s) and see if the fault moves. Maybe a faulty sensor. Martin Quote Link to comment Share on other sites More sharing options...
jiginc Posted August 22, 2009 Author Share Posted August 22, 2009 Swap the sensors over / clear code(s) and see if the fault moves. Maybe a faulty sensor. Martin Hi Martin, Will try this however. I have been advised by a LR tech that lambdas do not respond well to LPG and the best way to run it would be to remove the sensors and run on open loop. Any one got and comments on this!!!! Quote Link to comment Share on other sites More sharing options...
Ally V8 Posted August 22, 2009 Share Posted August 22, 2009 Most LR techs know little about LPG - only that it can cause problems.The inactivity of the oxygen sensor may be not the sensors fault,if the LPG system has not been fuelling acurately enough to match what the petrol ecu would do.Basically the long term fuel trims may not allow enough injector pulse width to get the sensor to switch up rich.Or it could be that the Maf is reading low as it slowly fails,a low reading again will not allow a wide enough pulse width on either fuel. As already said generic diagnostic kit does not work well on LR's,sometimes the truth will only come out on Testbook.What readings do you get from the Maf at idle,then at 3000rpm - hot engine with no loads ? Quote Link to comment Share on other sites More sharing options...
vougese39 Posted August 23, 2009 Share Posted August 23, 2009 with a fault like this and you are on gas is that the gas burns too cleanly and the ecu is thinking it is on petrol so rictchens the mixture or weakens it to compensate but when it switchs back to petrol the mixture is so rich or weak when it cannot adjust then the ecu throws a sensor fault Quote Link to comment Share on other sites More sharing options...
jiginc Posted August 25, 2009 Author Share Posted August 25, 2009 Many thanks for the help guys. I am away for the next 7 days but will resume the diagnostics when I return home. Will report back then. jiginc Quote Link to comment Share on other sites More sharing options...
jiginc Posted September 9, 2009 Author Share Posted September 9, 2009 As advised by the LR guy I have unplugged the Lambdas and it now runs fine no pops or judders. Not sure what it's done to the MPG but we shall see. It now runs open loop all the time as expected. Quote Link to comment Share on other sites More sharing options...
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