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306 1600 petrol 1995 failed mot on emissions co

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

Mar 21, 2017 | Mazda Cars & Trucks

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Help please guys Low idle 760rpm CO 0.78% above 30 fail Hc 193ppm Lambda 1.03 pass Fast idle 2780rpm CO 0.23% above 20 fail Hc 82ppm above 200 fail Any idea thanks

you have not mentioned the make and model of the vehicle
have the fault codes read and check for HO2S and O2 sensor problems
check for a failed cat converter

Sep 25, 2015 | Cars & Trucks

2 Answers

Emission test failed HC (PPM)

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.

Mar 12, 2013 | 1995 Geo Prizm

2 Answers

Golf 1.4 2003 very high emissions

Replace your oxygen sensors.

Aug 29, 2012 | 2003 Volkswagen Golf

2 Answers

Hi, 2000 Landrover Freelander 1.8 petrol, failed MOT on CO emissi

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.

Sep 26, 2009 | 2002 Land Rover Freelander

2 Answers

Emissions failing with high NOx

Change the lambda/oxygen sensor in the exhaust.

May 21, 2009 | 1994 Mitsubishi Galant

1 Answer

High CO emissions

run the fault codes and look for problem heated oxygen sensor ( HO2S) in the exhaust manifold , or problem oxygen sensor (O2S) after the cat converter, problem EGR system or problem cat converter

Apr 05, 2017 | 1995-1997 Chevy Suburban Ignition Starter...

1 Answer

My chevy s10 failed emissions

Have your cat. converter checked out. I just had one of these for the same reason in my shop today.

Jul 09, 2008 | 1991 Chevrolet S-10

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