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1996 Aero Manual (225hp)
For months now, I've been battling with a lean mixture problem on my '96 Aero. I know it is lean as it took two tries to scrape through the MOT (UK annual inspection) emissions test due to high lambda (lean mixture). Other symptoms are: misfire at 2000-3000 RPM no load (no gear selected), slow spool-up and lack of power despite healthy 1.1-1.2 bar boost.
What I've done:
Last June, I changed the oxygen sensor as a precaution at about 140K miles. The mixture may have been lean then, but I didn't notice. I noticed some time later while changing the plugs that the plugs looked a bit white.
I had chosen to use a universal 4-wire sensor (finally tracked the manufacturer down to Williams in the US). It did come with a slip saying that it shouldn't be used on 1996 and later vehicles.
Bearing this warning in mind, and with the MOT looming, I decided to look for an OEM sensor. Apparently, there are two types: one for everything except the B234R engine at £87 and one for the B234R at £322!!!
I went looking for a used one just to tackle the MOT and got one: Bosch part no. 0 258 003 574. Same problem.
I have since found the original sensor (what's left of it) and the part number is 0 258 003 662. Does anyone know what the difference is between these two sensors? I was under the impression that a 4-wire sensor is a 4-wire sensor, although a few cars use a linear sensor. Is this the case with the Aero? That might explain the price.
I did see, however, a post from BillR saying 662 was the part number on the sensor from his '96 LPT. Can anyone shed any light and explain the difference between these part numbers?
posted by 62.253...
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