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Heated Oxygen Sensors

 
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robin101fc



Joined: 16 Sep 2010
Posts: 13
Location: Norfolk

PostPosted: Wed Oct 17, 2012 2:27 pm    Post subject: Heated Oxygen Sensors Reply with quote

My motor doesn't appear to have ever had these fitted. At the last MOT the emissions were just on the max allowed; as I am in need of a new exhaust system do you think I should get these fitted?
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Robin
GB311
Rover Rescue BR28
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GB223



Joined: 28 Oct 2010
Posts: 111
Location: West Sussex

PostPosted: Mon Oct 22, 2012 9:30 am    Post subject: Reply with quote

Hi Robin,
The oxygen sensors must be 4-wire heated ones, and they are a very specific type (due to operating range) the OEM parts are hideously expensive from LR but available from the OEM manufacturer NTK for half the price. NTK number is OTD3J-5C1. any NGK / NTK stockist can get them.
When you say yours doesn't have them I expect you mean they are not heated ones, rather than no sensors at all? They should be fitted in the downpipe before the cats, and have Grey 4-pin plastic plugs (red-white-yellow-black wires), one of which is burried under the coil packs. Black plugs indicates that the Range-Rover ones have been used.
There is a glitch with the OBD codes which can be confusing. Some Discos had 4 Lambda sensors, 2 UPstream (before the cats) and 2 DOWNstream (after the cats). Although the 50th exhaust has ports for the DOWNstream ones they are not fitted. You may get an OBD code that indicates a sensor failure DOWNstream, but it is actually indicating the UPstream one on that bank.
Any good OBD reader can tell you if there is a fault
Hope that helps
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Captainbeaky



Joined: 23 Jan 2014
Posts: 116
Location: Madeira, Portugal

PostPosted: Thu Mar 18, 2021 5:33 pm    Post subject: Reply with quote

Thanks for that - I was looking for the NTK part number - much appreciated.
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Owner of GB386 50th Defender v8 - being rebuilt.

2013 Honda NC700X
2005 Honda XR250R
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