Neil Ramsey Posted September 22, 2023 Share Posted September 22, 2023 HelloHopefully someone can help me, I have a new (2023) 620S and am looking to buy a spare Lambda, does anyone know the Bosch part no.? Link to comment Share on other sites More sharing options...
Benton Posted September 22, 2023 Share Posted September 22, 2023 The original sensor fitted should have the original Ford part number stamped on it together with hopefully the Bosch equivalent number (provided you can still read the values ). There seem to be two types fitted to the 620's , one with a square connector and one with a round connector, though my 620R has a square to round connector subloom! The round connector is part no. Ford 3M51-9F472-BC. My "spare" (though I've never needed it) I bought "preowned" off EBay for £20!.Are you having problems hence your query? Update:- Forgot the Bosch part no! - 0258006599 Link to comment Share on other sites More sharing options...
Neil Ramsey Posted September 23, 2023 Author Share Posted September 23, 2023 Hi Bentonthank you for that, your part number seems to have a green connector on the end where as mine seems to have a black more square connection.my car is only a few months old (May 2023) and jafter 1,200 miles has been in to caterham as it was suffering with poor running and they replaced the Lambda. Link to comment Share on other sites More sharing options...
PlastererPete Posted September 23, 2023 Share Posted September 23, 2023 Not sure if it helps but my lambda sensor on my CSR is a Bosch 0258003229. Black four pin connector. CC don't strike me as the type of company to have a different part for a specific model. When I looked on their parts site it only listed two versions. Link to comment Share on other sites More sharing options...
Benton Posted September 24, 2023 Share Posted September 24, 2023 The fact that the Bosch 0258003229 type was originally a Rover lambda sensor and Bosch 0258006599 type was/is a generically used sensor across the Ford range, plus certainly in the case of Caterham Duratec applications I've come across both being used for 620 and 420 models, I wouldn't be surprised if Caterham use whatever they have in stock at build time! Whether the characteristics of the sensors are the same (part from their connector type/sub loom etc.) or they require different mapping/wiring who knows, I've never tried swapping the two. Link to comment Share on other sites More sharing options...
Neil Ramsey Posted September 26, 2023 Author Share Posted September 26, 2023 Interesting BentonMy Car Lambda has a black sq connector then a short converter loom to a green connector!Looking online:The Rover Lambda ( Bosch 0258003229) has a black sq connectorThe Ford Lambda (Bosch 0258006599) has a green more round connector Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted September 26, 2023 Member Share Posted September 26, 2023 "My Car Lambda has a black sq connector then a short converter loom to a green connector!"Please could add a photo.ThanksJonathan Link to comment Share on other sites More sharing options...
Benton Posted September 26, 2023 Share Posted September 26, 2023 This is the sub loom Though the Caterham labelling is slightly confusing as Duratecs use both types square and round Bosch lambdas. Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted September 26, 2023 Member Share Posted September 26, 2023 ThanksJonathan Link to comment Share on other sites More sharing options...
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