Question about 1992 Honda Accord
HC ppm limit 72 reading 158 fail CO% limit 0.40 reading 0.63 NO ppm limit 550 reading 1793 everything else passed 95 ford escort gt 1.8L
A failing oxygen (O2) -sensor will give failing emission tests. Normally you also get other symptoms:
- too high fuel consumtion
- bad acceleration, stalling problems, sputtering
- the check engine light comes on indicating that the engine control unit has recorded error codes (which will be related to readings of incorrect fuel/air ratio when read by the OBD diagnostics tool at a repair shop).
It is always a good idea to see if you can get any readings from the check engine light if present or much better by an OBD reader to be as certain as possible.
Another component that could cause failing emissions tests is the catalytic converter, giving a similar range of symptoms. To determine if this is the cause is not so easy on older cars with only one O2 sensor, it requires diagnostic skills and equipment. On newer cars with OBDII-systems it will give a recognizable fault code for the cat converter.
Then there are also the issues of the actual cause of malfunction in either or both of these components, is it due to old age and normal wear and tear or is it due to contamination from burning oil (blue tail pipe smoke) or anti-freeze (white smoke), misfiring, etc? Then the cause must be treated as well for a successful repair.
Normally these components have a very long life span and should not have to be replaced more than once or maybe twice for the sensors during the car's lifetime in an otherwise health engine.
Posted on May 25, 2009
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Posted on Jan 02, 2017
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