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Old 02-22-2005, 09:34 PM   #4
71swb4x4
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Join Date: Nov 2003
Location: Brookings, SD
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The Bosch LSU 4 sensor is a pump cell sensor like the NTK L1H1. The sensor requires a bung with an 18 mm diameter hole with 1.5 threads/mm pitch (this is one of the standard lambda sensor & sparkplug base sizes).

Here is some more support, everything I have found says 18mm x 1.5mm
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