Rich998a said:It is a Land Rover specific code. In other words, any other manufacturer listing the code would be irrelevant.
Have you checked it here?
I'm guessing you may have a Motronic EMS, and that system has more DTC's than the GEMS system.
EDIT - Just seen it is a 2000MY so it is Motronic. If you still have difficulty and there is no one else who can help, consider going onto the LR GTR and finding out the specifics of the code, using the search function based on your model and year.
Hopefully, this solves your DTC. :thumb:Range Rover (LP) from 1999 model year
Bosch Motronic M5.2.1 EMS
Oxygen sensor aging (characteristic shift) upstream bank A (front left hand sensor)
Lambda sensor aging tv bank 1 Drive cycle C:Signal out of range - above maximum.
Lambda sensor aging tv bank 1 Drive cycle C:Signal out of range - below minimum.
1.Deteriorated upstream oxygen sensor.
2.Deteriorated downstream oxygen sensor.
1. Deteriorated upstream oxygen sensor.
The Motronic ECM has internally diagnosed that the switching characteristics of this oxygen sensor have degraded to a point where exhaust emissions will be increased.
This fault is usually caused by the aging of the sensor in normal operation, however, this effect can be accelerated if the sensor has been contaminated with oil or other surface contamination.
2. Deteriorated downstream oxygen sensor.
The Motronic ECM has internally diagnosed that the characteristics of the upstream oxygen sensor have degraded to a point where exhaust emissions will be increased, however, this fault can sometimes be caused by the failure of the downstream sensor on the same bank causing an incorrect fault diagnosis. Also if both oxygen sensors (upstream and downstream) are flagged as faulty then the fault may in fact be only in the downstream sensor.
The fault is normally caused by the aging of the sensor(s) in normal operation, however, the effect can be accelerated if the sensor has been contaminated with oil or other surface contamination.
I've never been as far south as Zambia, not yet anyway... :thumb: TZ was a far south as I ever got in the Range Rover.Oxygen Sensors:
The US spec 4.0/4.6 has 4 Oxygen Sensors(one ahead of and one behind each catalytic converter), so replacing them all can get expensive. NOTE: If you get an aftermarket replacement, make sure it is a full 4-wire version, not a "4 wire to 3 wire" version -- see below. One useful source for looking up the sensors specified for the 4.0/4.6 is the manufacturer's website, NGK -- at www.ngk.com.
OEM "plug and play" replacements are available at The Rover Connection; the genuine O2 sensors for the 95-97 models (ERR1834) can be ordered from them for about $220 each, but they can supply aftermarket ones for $130. Sensors for the later models (AMR6244) are $180 from the same supplier. The lowest price I have seen for the OEM style plug and play sensor is $115 from automedicsupply.com (earlier model years); the lowest price I have found for the 1998 & up models is at Atlantic British which has OEM plug & play O2 sensors for $77.95 for the front ones (MHK100940) and $69.95 for the rear(MHK100930)!! (select their exhaust" category).
Michael Nix had the "Check Engine" light come on recently on his wife's 96 Range Rover. A trip to the dealer revealed confirmed that the engine had a slow oxygen sensor. Instead of paying the $275 from the dealer, he got one at a Nissan dealer for $90 (part number: 22690-85E10). He spliced the Range Rover connector on to the Nissan sensor and it fit perfectly. Three out of the four wire colors even matched up. I recently found this part by searching for its part number at Auto Parts Warehouse for $58.43!!
Alan Rawson delved more deeply into the O2 sensor problem on his 96 RR, adding substantially to our collective knowledge. He found the dealer price had dropped to $130. He found NAPA offers a similar item but with different connectors, their part # OS 778 (I recently looked it up and priced it at $81.99; it looks like the Nissan part mentioned above). Alan initially chose a Nissan part by NTK, which he found for $56 at a web company in southern CA., www.automedicsupply.com (their part # 250-2505). However, this replacement was a curious one with 4 wires at the connector reducing to 3 at the sensor. The vendor thought it would work fine, since the 4th wire is just data ground. All appeared to be OK at first, but Alan found that when the wires to one sensor were sheared off during an off-road trip the GEMS computer could not detect the problem (no light came on) and gas mileage went down the tubes. After further research, Alan found another part by NTK for $89.99 (current price $114.95 as of October 2003) which has the OEM connector (www.automedicsupply.com part number 250-8004) listed for the 4.0, quoted to replace OEM #70399A-- that number was stamped on his old original ones!). The 4th wire provides data ground, and with the semiconductor circuits used in the GEMS computer it appears to be important to have this separate ground, so the computer can detect failure of an individual sensor through the ground circuit. Ron Beckett checked the NGK manufacturer's website at www.ngksparkplugs.com and reports that their part number for the O2 sensor with the right plug for 95-98 models is 25017. Their UK site calls it a OTD3J-5C1, number of wires 4, connector style 57, lead length 521 mm. On Australian models a 3 wire unit is specified, OTD3G-3A1, with connector style 55.
Lowest Price (95-97 models): After scouring different sources for these parts, the best deal I have found so far was from a part number search for the Nissan equivalent 22690-85E10 at Auto Parts Warehouse (their part# C5010-65234) and found it there for $58.43 (free shipping). (To do a part number search on their site, go to the "Replacement Catalog" link on their main page). This is a Bosch part# 13388, and is the 4 wire version but with two connectors -- the wires can easily be spliced to the single Range Rover connector from your old part. For "Direct Fit" replacements with the OEM connector, the lowest price I have found is $114.95 at automedicsupply.com.(Click on year and make "Land Rover").
1998 & up models: the lowest price seems to be at Atlantic British which has OEM plug & play O2 sensors for $77.95 for the front ones (MHK100940) and $69.95 for the rear(MHK100930)!! (select their exhaust" category).