Specifically it is the heater circuit on the O2 sensor, but two sensors failed, one on each side?

Sounds spurious to me...

The more I read your posts the more I think electrical gremlins. Is your ECU box watertight? Have you popped the lid off to make sure all is well?

D

 

Hi,

I think the codes are not LR specific as they start p00.

Land rover specific codes:
http://www.robisonservice.com/servicedep/rover_obd2.asp

So generic codes would read:

P0034 Turbo Charger Bypass Valve Control Circuit Low
P0035 Turbo Charger Bypass Valve Control Circuit High
P0036 HO2S Heater Control C ircuit (Bank 1 Sensor 2)
P0037 HO2S Heater Control Circuit Low (Bank 1 Sensor 2)
P0038 HO2S Heater Control Circuit High (Bank 1 Sensor 2)
P0039 Turbo/Super Charger Bypass Valve Control Circuit Range/Performance
P0040 O2 Sensor Signals Swapped Bank 1 Sensor 1/ Bank 2 Sensor 1
P0041 O2 Sensor Signals Swapped Bank 1 Sensor 2/ Bank 2 Sensor 2
P0042 HO2S Heater Control Circuit (Bank 1 Sensor 3)
P0043 HO2S Heater Control Circuit Low (Bank 1 Sensor 3)
P0044 HO2S Heater Control Circuit High (Bank 1 Sensor 3)
P0045 Turbo/Super Charger Boost Control Solenoid Circuit/Open
P0046 Turbo/Super Charger Boost Control Solenoid Circuit Range/Performance
P0047 Turbo/Super Charger Boost Control Solenoid Circuit Low
P0048 Turbo/Super Charger Boost Control Solenoid Circuit High
P0049 Turbo/Super Charger Turbine Overspeed
P0050 HO2S Heater Control Circuit (Bank 2 Sensor 1)
P0051 HO2S Heater Control Circuit Low (Bank 2 Sensor 1)
P0052 HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0053 HO2S Heater Resistance (Bank 1 Sensor 1)
P0054 HO2S Heater Resistance (Bank 1 Sensor 2)
P0055 HO2S Heater Resistance (Bank 1 Sensor 3)
P0056 HO2S Heater Control Circuit (Bank 2 Sensor 2)
P0057 HO2S Heater Control Circuit Low (Bank 2 Sensor 2)
P0058 HO2S Heater Control Circuit High (Bank 2 Sensor 2)


If you read p0136 and p0156 then you are looking at the o2 sensors as shown below:

P0134 O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
P0135 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
P0136 O2 Sensor Circuit Malfunction (Bank 1 Sensor 2)
P0137 O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)
P0138 O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)
P0139 O2 Sensor Circuit Slow Response (Bank 1 Sensor 2)
P0140 O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 2)
P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
P0142 O2 Sensor Circuit Malfunction (Bank 1 Sensor 3)
P0143 O2 Sensor Circuit Low Voltage (Bank 1 Sensor 3)
P0144 O2 Sensor Circuit High Voltage (Bank 1 Sensor 3)
P0145 O2 Sensor Circuit Slow Response (Bank 1 Sensor 3)
P0146 O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 3)
P0147 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 3)
P0150 O2 Sensor Circuit Malfunction (Bank 2 Sensor 1)
P0151 O2 Sensor Circuit Low Voltage (Bank 2 Sensor 1)
P0152 O2 Sensor Circuit High Voltage (Bank 2 Sensor 1)
P0153 O2 Sensor Circuit Slow Response (Bank 2 Sensor 1)
P0154 O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 1)
P0155 O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)
P0156 O2 Sensor Circuit Malfunction (Bank 2 Sensor 2)
P0157 O2 Sensor Circuit Low Voltage (Bank 2 Sensor 2)
P0158 O2 Sensor Circuit High Voltage (Bank 2 Sensor 2)

Any help?

 

Yep thanks, also getting "Sensor 1 Bank 1 Not Present" when I do an O2 sensor scan.

Which is odd as both the error codes relate to the second sensor on both banks...???

:think:

 

Have you visually inspected the O2 sensors? In addition to fault errors if you are receiving an error that one is not even there I would lean towards harness damage. I suppose it is possible that they could have simply come loose as well. I would be checking for burned or chafed wiring and connection issues before getting too far.

 

Yeah had a quick look the other day, wiring looked ok - they look like the OE items (2003 car) so might be worth pulling them out and having a look.
Will get back under the car tomorrow and take a better look at the wiring as it is quite hard to see.

Out of interest - would this be causing my problem do you think.. or is it another wild goose chase!

 

Yeah had a quick look the other day, wiring looked ok - they look like the OE items (2003 car) so might be worth pulling them out and having a look.
Will get back under the car tomorrow and take a better look at the wiring as it is quite hard to see.

Out of interest - would this be causing my problem do you think.. or is it another wild goose chase!

A friend's O2 sensor failed whilst on holiday which meant the car wouldnt rev above idle (actually now my car) replaced that and all was fine.

 

Update..

I decided to change the rear O2 sensors.... bad move!
The front ones had previously come out with out so much as a bead of sweat..
The rears... cracked - turned about 1/4 turn and promptly stuck!
After much shouting and :crybaby2: they eventually came out... but the threads in the exhaust are fuggered!

Will now have to drop the entire system off the car (easy eh!) and try and tap out a new thread.

Anyone else had this problem? The o2 sensors looked factory - so well over 7 years old now.

New o2 sensors on order for tomorrow.

After all this the problem best be solved with all this faffing about!! :doh:

 

Will now have to drop the entire system off the car (easy eh!) and try and tap out a new thread.

If you have a welder just weld a new o2 bung on it or take it to a muffler shop and have them do it.

 

Good plan. I do have a welder. Well, I have a man that can weld... IYSWIM! :thumb:
Will give the local motor factors a call in the am to see if they can bring a couple of those rings with them. I assume thats a common problem then!