O2 sensor help - Land Rovers Only

Wild Driver · 02-22-2008, 03:03 PM

Ok
I have some codes showing and kind of need a diagnosis on why. Is a fix as simple as sensor replacement?
P0304-Cylinder 4 misfire detected Plug wire bad??
P0154-O2 sensor curcuit No activity (bank 2 sensor 1)
P0135-O2 sensor heater circuit malfunction (bank 1 sensor 1)
P0155-O2 sensor heater circuit malfunction (bank 2 sensor 1)
P1590-rough road abs How do you fix this????

So, why the malfunction codes and how do I fix?
Thanks in advance.

Disco Mike · 02-22-2008, 04:31 PM

How many miles on the engine, when was it last tuned and what octane gas are you running?
Mike

Wild Driver · 02-22-2008, 08:38 PM

Mileage is 136000,
I am running 92 octane now but just ran a tank of 87!!!!!!!!!!!!
Any ideas?
OH, previously it was showing an emissions leak but it did not throw that code this time. Thanks

Disco Mike · 02-23-2008, 07:46 AM

With your mileage, I would replace all 4 02 sensors, they are warn out.
Should be able to find them at Atlantic British or Rover Connection for around $65 a piece.
Mike

Wild Driver · 02-23-2008, 11:30 AM

Thanks Mike,
Will do.
I fixed the #4 cylinder misfire, the wire was just loose on the plug, thank goodness.
Will new O2 sensors turn off the heater circuit malfunction code?
Thanks.

Disco Mike · 02-23-2008, 04:32 PM

I believe that code can come from an internal 02 heater fault and possibily from a harness issue, so for now I am going to say I think so unless Elemental or one of the other tech.s say something else.
Mike

02-22-2008, 03:03 PM	#1 (permalink)
Wild Driver Member Join Date: Nov 2007 Posts: 33 Gallery: 0	O2 sensor help Ok I have some codes showing and kind of need a diagnosis on why. Is a fix as simple as sensor replacement? P0304-Cylinder 4 misfire detected Plug wire bad?? P0154-O2 sensor curcuit No activity (bank 2 sensor 1) P0135-O2 sensor heater circuit malfunction (bank 1 sensor 1) P0155-O2 sensor heater circuit malfunction (bank 2 sensor 1) P1590-rough road abs How do you fix this???? So, why the malfunction codes and how do I fix? Thanks in advance.

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02-22-2008, 04:31 PM	#2 (permalink)
Disco Mike Moderator Join Date: Aug 2004 Location: Parker, Colorado Posts: 5,784 Gallery: 0	How many miles on the engine, when was it last tuned and what octane gas are you running? Mike

02-22-2008, 08:38 PM	#3 (permalink)
Wild Driver Member Join Date: Nov 2007 Posts: 33 Gallery: 0	Mileage is 136000, I am running 92 octane now but just ran a tank of 87!!!!!!!!!!!! Any ideas? OH, previously it was showing an emissions leak but it did not throw that code this time. Thanks

02-23-2008, 07:46 AM	#4 (permalink)
Disco Mike Moderator Join Date: Aug 2004 Location: Parker, Colorado Posts: 5,784 Gallery: 0	With your mileage, I would replace all 4 02 sensors, they are warn out. Should be able to find them at Atlantic British or Rover Connection for around $65 a piece. Mike

02-23-2008, 11:30 AM	#5 (permalink)
Wild Driver Member Join Date: Nov 2007 Posts: 33 Gallery: 0	Thanks Mike, Will do. I fixed the #4 cylinder misfire, the wire was just loose on the plug, thank goodness. Will new O2 sensors turn off the heater circuit malfunction code? Thanks.

02-23-2008, 04:32 PM	#6 (permalink)
Disco Mike Moderator Join Date: Aug 2004 Location: Parker, Colorado Posts: 5,784 Gallery: 0	I believe that code can come from an internal 02 heater fault and possibily from a harness issue, so for now I am going to say I think so unless Elemental or one of the other tech.s say something else. Mike

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