2005 HSE Slow O2 sensor reading - Defender Source
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  #1  
Old November 15th, 2013, 07:56 PM
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Brian Kandefer
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2005 HSE Slow O2 sensor reading

My 2005 big body is throwing two codes p2a00 and p2a03 which is saying that the 02 sensor is aging. We have replaced 02sensors cats and smoke tested PVC hoses with no avail the codes come right back within 40 miles or so. When we watch the 02 readings the back ones are on point but the front read really slow. Thinking it's a ground issue but not sure, I don't want to replace the Ecu before we know for a fact that is what it is. Anyone on here have any idea??? Any help would be appreciated.
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  #2  
Old November 15th, 2013, 09:55 PM
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The code readings for BMW Range Rovers are all fucked up from the factory. Using T4, it will give a fault for an upstream O2 sensor, but when you select Explorer (possible faults), it will say that the down stream O2 sensor is at fault.

Those faults are usually from a cracked convertor, which should be covered under the catalyst warranty which was extended to 120k(I think) by Land Rover. Look very closely at the welds around the convertors. For some reason a crack after the upstream O2 will cause a fault indicating a defective upstream O2 sensor. If you see any cracks, take it to the dealer and get it fixed under warranty if you are within the mileage limitation.
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Old November 15th, 2013, 10:02 PM
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Cats have been replaced, we scoped the upstream 02's tonight and they read great before the DME but the auto logic is showing them super slow. Looking into see if anyone does repair or programming on the DME before I buy a new one .
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Old November 15th, 2013, 10:07 PM
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I've never run into that. Did you use aftermarket sensors?
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Old November 15th, 2013, 10:11 PM
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Quote:
Originally Posted by Jymmiejamz View Post
I've never run into that. Did you use aftermarket sensors?
we used Bosch first then OE and it didn't matter. We also smoked the vacuum lines tonight and the exhaust to triple check everything. I even switched the exhaust with a customers stock exhaust with no issues, it still threw the code in less then 45 miles.
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Old November 15th, 2013, 10:16 PM
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Quote:
Originally Posted by Brewie212 View Post
we used Bosch first then OE and it didn't matter. We also smoked the vacuum lines tonight and the exhaust to triple check everything. I even switched the exhaust with a customers stock exhaust with no issues, it still threw the code in less then 45 miles.
Well if its not the sensors or cats, it must either be wiring or the PCM. The reason I asked about the sensors is that we've run into a lot of issues with aftermarket sensors at the dealership. We also had four or five bad genuine sensors out of the box. Sorry I couldn't help, good luck! Btw, you may want to try posting this on rangerovers.net, someone there has probably run into this before.
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Old November 15th, 2013, 10:22 PM
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Brian Kandefer
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Thanks man, we have had issues with sensors as well. We dealt with something similar a couple months ago and it was the Cats. First time we have had to go this far, that's why we scoped the sensor wires at the computer to compare it to what the computer was reading. Agree 100% that it's either the harness or the DME
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Old November 17th, 2013, 09:37 PM
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Really weird, after playing with the DME Friday night the light shut off all day Saturday and then kicked back on today?? Not sure if it's the wiring harness or the DME
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Old November 17th, 2013, 10:04 PM
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Have you reset the adaptations?
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Old November 17th, 2013, 10:06 PM
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Quote:
Originally Posted by Jymmiejamz View Post
Have you reset the adaptations?
? We have cleared DtC codes
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