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post #1 of 2 (permalink) Old 02-22-08, 12:34 PM Thread Starter
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Taurus runs poorly when warmed up

99 taurus duratec 120k. At first it would stall out in idle & service engine light on. Replaced the front two 02 sensors & found & fixed vacuum leak(phlegm). It no longer stalls in idle. However, now it runs rough after going 20 miles, uses excessive gas. Service engine light on again. Scanner shows one back 02 sensor and engine running rich & lean. I then replaced fuel filter& TPS . Should I replace the one back 02 sensor. One ford mechanic told me the back 2 O2 sensors have nothing to do with the performance of the car. Please help

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post #2 of 2 (permalink) Old 02-29-08, 06:33 PM
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Exclamation Re: taurus runs poorly when warmed up

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Originally Posted by bettywilson4 View Post
99 taurus duratec 120k. At first it would stall out in idle & service engine light on. Replaced the front two 02 sensors & found & fixed vacuum leak(phlegm). It no longer stalls in idle. However, now it runs rough after going 20 miles, uses excessive gas. Service engine light on again. Scanner shows one back 02 sensor and engine running rich & lean. I then replaced fuel filter& TPS . Should I replace the one back 02 sensor. One ford mechanic told me the back 2 O2 sensors have nothing to do with the performance of the car. Please help
You say front O2 sensors were replaced. Do you mean the upstream ones??? I know on a Chrysler the downstream ones do factor into the fuel trim for emissions besides the normal function of seeing what the cats. are doing. What's the exact code you got??? The P---- number.

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