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The table below shows a selection of 4 Gas Analysis samples, taken from vehicle case studies.
They were measured using a SUN DGA 1800 analyser.

RPM	CO%	CO2%	HC ppm	O2%	Lambda	Vehicle	Condition
Idle	2.84	13.03	436	0.50	0.925	307 TU5 (1)	Engine just started from cold, illustrating rich mixture and cold catalyst (No Fault)
Idle	0.00	15.18	47	0.06	1.001	307 TU5 (2)	As above, approximately 1 minute later (No Fault)
Idle	0.38	14.28	153	0.69	1.015	307 EW10 (1)	Engine cold, catalyst not warmed up (No Fault)
Idle	0.00	15.12	0	0.00	1.000	307 EW10 (2)	As above, engine hot (No Fault)
Idle	0.00	14.08	0	1.46	1.073	806 EW10	Injector misfire
Idle	3.47	12.83	269	0.03	0.896	306 TU5	Forced Rich mixture, ECT High resistance & O2 sensor O/C
Idle	0.00	11.89	49	4.51	1.263	306 TU5	Forced Rich mixture, ECT High resistance & O2 sensor O/C plus Injection misfire
Idle	3.30	5.50	2232	9.77	O/L	106 TU1 (1)	Massive air leak at the inlet manifold, caused by brake servo hose disconnected
Idle	0.38	14.29	168	0.60	1.011	106 TU1 (2)	After repair of above fault, the catalyst is shown to be inefficient
Idle	0.96	13.18	307	1.78	1.045	306 XU7JP4	Vehicle is equipped with a motor factors replacement catalyst. The catalyst is shown to be inefficient
Idle	0.50	14.82	1591	0.06	0.931	205 XU5M	Hot engine with induced ignition misfire.(Plug lead disconnected). Unsure why the oxygen value is so low, I presume due to the catalyst action.
2000 RPM	0.05	15.16	67	0.06	0.998	605 xu10 j4 auto 1	Hot engine, vehicle suffering from sluggish response and lack of power. Sharp acceleration created 1.5bar back pressure at catalyst.
2000 RPM	0.00	15.35	6	0.01	1.000	605 xu10 j4 auto 2	Hot engine, new catalyst fitted. Vehicle returned to normal performance.
Idle	0.00	14.30	2	1.06	1.052	806 xu10 j2 High mileage (1)	Hot engine, partial engine misfire evident. Note the following; especially cylinder No 4.
Idle	0.00	12.96	14	2.83	1.153	806 xu10 j2 High mileage (2)	Hot engine. Cylinder No. 4 injector disconnected
Idle	0.00	12.05	17	4.02	1.233	806 xu10 j2 High mileage (3)	Hot engine. Cylinder No. 3 injector disconnected.
Idle	0.00	12.02	14	4.15	1.242	806 xu10 j2 High mileage (4)	Hot engine. Cylinder No. 2 injector disconnected.
Idle	0.00	12.14	16	4.01	1.232	806 xu10 j2 High mileage (5)	Hot engine. Cylinder No. 1 injector disconnected.
Idle	0.51	13.22	116	1.77	1.069	106 GTI (NFX)-(1)	Hot engine, MOT failure. New catalyst had been fitted. Not genuine and cheap!!
2000	0.67	13.52	147	1.39	1.041	106 GTI (NFX)-(2)	As above, hot engine, MOT failure. New catalyst had been fitted. Not genuine and cheap!!