Support chips for Bosch LSU4 O2 sensor

   I would like to construct a wideband o2 sensor using a Bosch LSU4 sensor. I have a front sensor from a VW 1.8 engine ( about US$40.00 ). I understand that there are some Bosch support IC's for this application, part numbers CJ110 and CJ125. Does anyone know where I could purchase these parts and their data sheets?
   Also, the only technical info I have for this sensor is the 22 page Bosch (english)document dated 25.1.99  . I would appreciate any other tech info that you could point me to.
Thanks,
-Dana

Dana,

It really depends on how wide a range you want to measure and the level of accuracy you require.  I have found that sensor to be very inaccurate below 13.5 A/F and above 15.1 A/F for gasoline.  These limitations of that sensor may not be what you want, or can live with.  There are several sources for wideband meters, in no particular order...Bosch, Motec, Lambdaboy, FJO Enterprises, Horiba.

I have not seen any more recent data on the LSU4 than what you have.

I suppose the supporting hardware was bad in your case. Dynojet uses the LSU4 sensor, they work excellent in the area you have to work, from 10:1 to 28:1. Use it everyday to performance tune cars. I am not an electronic engineer so can't tell you how to make the supporting hardware but the sensor is good. There is a lot involved in making good supporting hardware, look at the complete datasheet on http://wbo2.com/lsu/Y258K01005e03mar21eng.pdf. Since there is no point running a gasoline engine richer than 11:1 these sensors are good for measuring lambda for these as well as diesel engines, which can run a lot leaner.

Tell me where you buy them for $40 and will order a bunch...

Hope this helps

Walk up to the parts department window of your local VW dealer and ask for a 021-906-262-B. Should be about $40.

Thanks, will try that, buy them now at $120 from the GM dealer...

A bit off-topic, but does anyone have an ETAS LA3 meter they would sell me.....

Andy

There are several wide band O2 contoller boards available.  Tech Edge has a DIY kit.  It is their version 2.0.  Also, check out Innovate! Technology, Inc.  These boards are about $350 made up.  The TE kit is less.Best regards. Jim

Checked the price with the VW dealer, 154 Euros(!). Saw the best price on the net in the USA for $28.99 (!) What a rip-off.  Unfortunately it isn't worth buying it there if you only need 2 or so.