Question about 1995 Ford Escort

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Ford failed MOT on High CO emission

Hi. My Ford Escort 1.6 lx/orion engin 44.920 m. just failed MOT in high CO emission. This are results: Fast Idle Test:CO 0.620 Second Fast Idle Test: CO 0.636 Natural Idle Test: 0.809.! The guy from MOT will do an investigation on monday.... but i want to know what i can do it and what that could be. Any tips before i go there??? also how expensive it could be... cheeerss

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High CO usualy means the O2 sensors are not reading properly. Take it to a parts store that can read codes, I know Auto Zone does in my area. If it is the O2 sensor it is an easy fix but the sensors run about $50.00 each.

Posted on Apr 20, 2009

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Hi Don,

First, thank you for asking me for my input on this. It just so happens, that I used to own a Ford ranger that had the same engine as yours. It was a 1990, but there are few changes to these model years.

Anyway, there is only one reason that your HC levels would be high. Your engine has WAY too much unburned fuel in the exhaust. The same reason applies to high CO levels. Too much fuel and/or not enough air.

Below is a link that you may find very helpful. It explains exactly what we are talking about here and also lists some of the possible causes.

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Incidently, when I had the same emissions failure on my truck, replacing the air filter and replacing a failed MAP sensor fixed it. - I did NOT have to replace the catalytic converter. If the numbers are as high as you listed above, you will only destroy a new converter anyway because there is obviously not enough oxygen in your exhaust system for the catalyst to function properly. Those numbers are nearly DOUBLE the allowable maximum. If the engine is running correctly and the catalyst is good, your numbers will be WAY BELOW those maximum numbers.

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