# 2002 ford windstar code 171 / 174 **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [August 13, 2008, 11:35pm UTC](https://community.cartalk.com/t/2002-ford-windstar-code-171-174/18147 "2008-08-13T23:35:45Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![mj\_wald](https://avatars.discourse-cdn.com/v4/letter/m/e95f7d/32.png) [@mj\_wald](https://community.cartalk.com/u/mj_wald)\ **Post date:** [August 13, 2008, 11:35pm UTC](https://community.cartalk.com/t/2002-ford-windstar-code-171-174/18147/1 "2008-08-13T23:35:45Z")
OK I had a check engine light on and a high idle. Auto Zone said I had codes 171 and 174, told me to replace the MAF. I did so. The high idle turned into a very low idle about 500 RPM, and the codes are still being generated. Took it to the garage, they say I have a warped manifold. They want $500.00 to fix. Does this sound correct? ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [August 14, 2008, 12:19am UTC](https://community.cartalk.com/t/2002-ford-windstar-code-171-174/18147/2 "2008-08-14T00:19:17Z")
Telling you to replace the MAF sensor was poor advice. The #1 O2 sensor compares the amount of oxygen in the exhaust stream compared to the amount of air the MAF sensor detects. If the O2 sensor detects a higher content of oxygen in the exhaust stream compared to what the MAF sensor detects, you’ll get this code. So in this case, I would look for an intake leak somewhere after the MAF sensor. And it could be an intake manifold/gasket(s). Tester ---
**Author:** ![vwfueldoor](https://avatars.discourse-cdn.com/v4/letter/v/e95f7d/32.png) [@vwfueldoor](https://community.cartalk.com/u/vwfueldoor)\ **Post date:** [August 14, 2008, 12:22am UTC](https://community.cartalk.com/t/2002-ford-windstar-code-171-174/18147/3 "2008-08-14T00:22:41Z")
agreed,check the PCV hose for cracks. out!