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David C · 11-02-2008

If the ECU expects there to be a Lambda sensor, you are better off keeping it.

The Lambda sensor controls air/fuel ratios, without it the ECU may set to a default but it will run better in most situations with the sensor fitted.

I expect your Lambda sensor was located before the Cat, so it will operate exactly the same now as it did when the Cat was there.

Until the introduction of Euro3 specs in mid 2000 ECUs didn't monitor or care if the Cat was there or not.

11-02-2008	#3 (Post Link)
David C AO Gold Member Join Date: Aug 2003 Location: London, England Posts: 8,099 Member car: 156 Selespeed sp3	Re: Spider Series 3 Cat removal If the ECU expects there to be a Lambda sensor, you are better off keeping it. The Lambda sensor controls air/fuel ratios, without it the ECU may set to a default but it will run better in most situations with the sensor fitted. I expect your Lambda sensor was located before the Cat, so it will operate exactly the same now as it did when the Cat was there. Until the introduction of Euro3 specs in mid 2000 ECUs didn't monitor or care if the Cat was there or not.