306 1600 petrol 1995 failed mot on emissions co high hc high lambda fail loated to replace either cat or oxy sensor no oil showing in sump but lots of oil in air box and pipe from top of rocker cover is there a crank case breather pipe on this engine or what may be causeing the problem and what is the solution
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if the cat is a stand alone cat with no downstream lamda sensor then all that wil happen is the emissions will be high if in the uk that would fail the mot test 1 having no cat fitted if that model/year should have plus out of spec emissions if its got a downstream lambda and removed/disconnected will display a engine warning and put the engine control module into default
i can be, only 2 things, or both. 1: engine running way too rich. 2: dead cat. (both happens, too) replace the cat, might be cheaper that full engine diagnosis and repair. in a real shop we test the cat. using up and down stream tests. with the 5 gas analyser. but the truth is a new CAT can hide a very filthy running motor.
check both lambda sensors for breaks in wires and for open circuit on heater side of lambda sensor on the one under the car on the second cat,failed heater element will not heat gas engough for sensor to read causing false readings , also check for slow i.a.c valve on inlet manifold.