# 1995 Taurus OBDI Check Engine Light On Code 172

**URL:** <https://community.cartalk.com/t/1995-taurus-obdi-check-engine-light-on-code-172/74531>\
**Category:** Maintenance/Repairs\
**Tags:** ford, taurus\
**Created:** [September 8, 2012, 10:06pm UTC](https://community.cartalk.com/t/1995-taurus-obdi-check-engine-light-on-code-172/74531 "2012-09-08T22:06:39Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![LeRoy](https://avatars.discourse-cdn.com/v4/letter/l/e0b2c6/32.png) [@LeRoy](https://community.cartalk.com/u/LeRoy)\
**Post date:** [September 8, 2012, 10:06pm UTC](https://community.cartalk.com/t/1995-taurus-obdi-check-engine-light-on-code-172/74531/1 "2012-09-08T22:06:39Z")

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My Taurus runs fine. The check engine light comes on a little while after I start the engine! The diagnostic trouble code reads 172, lack of heated oxygen sensor switches, indicates lean bank #1. This year I have replaced the cap, rotor, plugs, wires, both heated oxygen sensors, fuel filter, MAF sensor, fuel pressure regulator. I am satisfied that there are no vacuum leaks that I haven’t repaired! I reset the check engine light by disconnecting the ground cable for a few minutes.  
How can I get the check engine light to stay off?