Abstract: A galvanic exhaust gas sensor having a solid electrolyte disc having a porous electrode thereon for detecting oxygen partial pressure in an exhaust gas stream varying in its flow and composition and having a shield protecting the porous electrode from direct impingement of exhaust gas stream. The shield includes means for accelerating exhaust gas from across the disc face at exhaust gas stream velocities and pressures below a preselected level and for maintaining said flow more constant at exhaust gas stream velocities and pressures above the preselected level, effective to more accurately sense variations in oxygen content of the exhaust gas stream at a porous electrode.

Abstract: Procedure and apparatus for monitoring the lash and the toe-in of a vehicle steering system by comparing the angular position of the vehicle's steering wheel as the front wheel spindles pass through preselected reference positions during tuning maneuvers. For example, an angular position transducer at one front wheel determines the instant at which that wheel spindle crosses the reference position in one direction and gates the output of an angular position transducer of the steering wheel to a comparator which stores the signal corresponding to the instantaneous angular position of the steering wheel.