Can any one tell me what a suitable distance is for the sensor to have a decent length of life and still be accurate? Does it make much difference?
I've posted the installation spec's below. In a general sense, closer is better, but not so close it overheats (>600°C wrench hex temperature continuous is the critical spec). As-mentioned, it also has a heater allowing you to place it further down the exhaust if you prefer for any reason, such as reading two engine banks for average Lambda/AFR or temporary placement at the tailpipe for dyno use, etc.
Bosch wrote:4.3.1 Design measures:
- Locate sensor as close to the engine as possible, respecting max. allowed temperature range
- The exhaust pipe in front of the sensor must not contain any pockets,
projections, protrusions, edges flex-tubes etc. to avoid accumulation of
condensation water. A downwards slope of the pipe is recommended.
- Make sure, that the front hole of the double protection tube does not
point against exhaust gas stream.
- Attempt to achieve rapid heating-up of the exhaust pipes in the area in
front of the sensor and also of the complete sensor thread boss area, to
avoid developing of condensation water
- The sensor thread boss must be designed as shown in 4.9 to reach a rapid
heat up of the sensor protection tube area. Make sure, that the protection tube is fully reaching into the exhaust gas stream.
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