# Computer codes

**URL:** <https://community.cartalk.com/t/computer-codes/58410>\
**Category:** Maintenance/Repairs\
**Tags:** explorer, ford\
**Created:** [December 7, 2010, 7:52pm UTC](https://community.cartalk.com/t/computer-codes/58410 "2010-12-07T19:52:33Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![ned582](https://avatars.discourse-cdn.com/v4/letter/n/9e8a1a/32.png) [@ned582](https://community.cartalk.com/u/ned582)\
**Post date:** [December 7, 2010, 7:52pm UTC](https://community.cartalk.com/t/computer-codes/58410/1 "2010-12-07T19:52:33Z")

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I have a 1999 Ford Explorer that has 125,000 miles on it. The check engine light came on about 2 weeks ago. I order the Innova 3110 scan tool. The two codes that are coming up with this device are PO171 and PO 174 - and that is all I have to work with. I need guidance as to where to start in the area

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**Author:** ![tardis](https://avatars.discourse-cdn.com/v4/letter/t/f0a364/32.png) [@tardis](https://community.cartalk.com/u/tardis)\
**Post date:** [December 7, 2010, 8:05pm UTC](https://community.cartalk.com/t/computer-codes/58410/2 "2010-12-07T20:05:48Z")

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Here’s three things to try.

1. Clean the MAF cleaner with MAF safe spray.
2. Look for air/vacuum leaks at the intake.
3. Check the fuel pressure.