# Engine Light 99 Windstar

**URL:** <https://community.cartalk.com/t/engine-light-99-windstar/37825>\
**Category:** Maintenance/Repairs\
**Tags:** windstar, ford\
**Created:** [October 9, 2009, 11:03am UTC](https://community.cartalk.com/t/engine-light-99-windstar/37825 "2009-10-09T11:03:54Z")\
**Posts on this page:** 6\
**Page:** 1

<div class="post-metadata">

**Author:** ![joeydee](https://avatars.discourse-cdn.com/v4/letter/j/a587f6/32.png) [@joeydee](https://community.cartalk.com/u/joeydee)\
**Post date:** [October 9, 2009, 11:03am UTC](https://community.cartalk.com/t/engine-light-99-windstar/37825/1 "2009-10-09T11:03:54Z")

</div>

The engine won’t stay off to pass inspection despite repeated attempts by my mechanic to find the problem

---

<div class="post-metadata">

**Author:** ![cigroller](https://avatars.discourse-cdn.com/v4/letter/c/c68b51/32.png) [@cigroller](https://community.cartalk.com/u/cigroller)\
**Post date:** [October 9, 2009, 12:38pm UTC](https://community.cartalk.com/t/engine-light-99-windstar/37825/2 "2009-10-09T12:38:11Z")

</div>

So are you just voicing a complaint, or would you like to ask a question?

What are the codes that are triggering the light? What has the mechanic done? It is impossible for anyone to say anything at all w/out that info.

The codes will be in the forms of a letter followed by 4 numbers such as P0123.

Ask your mechanic for the codes - actual code, not any interpretation - and post them. If you can’t get it from them go to a big-chain auto parts store such as Autozone where they will often read them for free.

Get the codes and post them - include what your mechanic has done. Include the maintenance history especially with regards to how that matches what the owner’s manual calls for. (E.g. “regular oil changes” is not enough info and is probably irrelevant to this).

---

<div class="post-metadata">

**Author:** ![joeydee](https://avatars.discourse-cdn.com/v4/letter/j/a587f6/32.png) [@joeydee](https://community.cartalk.com/u/joeydee)\
**Post date:** [October 10, 2009, 12:06am UTC](https://community.cartalk.com/t/engine-light-99-windstar/37825/3 "2009-10-10T00:06:10Z")

</div>

My mechanic has done the following changes: a fuel filter change; a fuel injector flush; repaired the intake manifold runner control activator; changed the plenom gasket, changed the throttle body gasket.

---

<div class="post-metadata">

**Author:** ![cigroller](https://avatars.discourse-cdn.com/v4/letter/c/c68b51/32.png) [@cigroller](https://community.cartalk.com/u/cigroller)\
**Post date:** [October 10, 2009, 3:11am UTC](https://community.cartalk.com/t/engine-light-99-windstar/37825/4 "2009-10-10T03:11:05Z")

</div>

ok - but what are the codes?

---

<div class="post-metadata">

**Author:** ![joeydee](https://avatars.discourse-cdn.com/v4/letter/j/a587f6/32.png) [@joeydee](https://community.cartalk.com/u/joeydee)\
**Post date:** [October 10, 2009, 3:28pm UTC](https://community.cartalk.com/t/engine-light-99-windstar/37825/5 "2009-10-10T15:28:08Z")

</div>

I got the codes. They are:  
PO171 and PO174

---

<div class="post-metadata">

**Author:** ![cigroller](https://avatars.discourse-cdn.com/v4/letter/c/c68b51/32.png) [@cigroller](https://community.cartalk.com/u/cigroller)\
**Post date:** [October 10, 2009, 6:20pm UTC](https://community.cartalk.com/t/engine-light-99-windstar/37825/6 "2009-10-10T18:20:16Z")

</div>

Check out this discussion: [http://www.aa1car.com/library/ford\_lean\_codes.htm](http://www.aa1car.com/library/ford_lean_codes.htm)

There are lots & lots of possibilities, and all of them have to be chased down. I always start with the simplest - vacuum leaks. I’d imagine that the intake & tb gaskets were replaced with this in mind, but was there ever any verification that either was leaking? Has the fuel pressure been checked? The MAF sensor cleaned? Etc.