Engine control system light on. - Alfa Romeo Forum
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Engine control system light on.

Came on a couple of weeks ago.A friend plugged in his computer which said it was a lambda sensor,one below the catalyst, fault .It also said it was sensor 2 located on bank 1.The code number is PO139,but also showed code PO141.Any technical members ou there who could enlighten me a bit more please ?Where would be the best place to purchase a sensor if it proved to be faulty.
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