Code P0172

[BigRedXLT]

Okay so does anybody know why I keep pulling a code P0172 (LT Fuel Trim at -19). I've tried everything I could think of and I cannot get it to go away. Anybody have any thoughts or ideas on this one?

[Jersey_Joe]

Do u have an exhaust leak in the manifold?

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Btw. Welcome to the forum

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[BigRedXLT]

I could.. Any special ways to check for that?

[Jersey_Joe]

Look for holes or listen for a leak. If your pulling a lean code. The engine is compensating. Too much fuel. Or too much air. Or not enough back pressure. Which in turn can pull the check engine light. I had an 03' for a looooong time lol. Did it tell u what cylinder it was?

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Part 1 -Troubleshooting P0172 and P0175 (Ford 4.6L, 5.4L)

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If that doesn't get u going. Leme know. There are more options. Good luck

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[BigRedXLT]

Okay I'll give that a shot tomorrow. But no I just pull the code P0172 which is in bank one. My LT is -19 which is wayyyy to much! But thanks for the advice I will let you know.

[BigRedXLT]

Look for holes or listen for a leak. If your pulling a lean code. The engine is compensating. Too much fuel. Or too much air. Or not enough back pressure. Which in turn can pull the check engine light. I had an 03' for a looooong time lol. Did it tell u what cylinder it was? lit up by F150leds.com & 5Star tuned.... ---------- Part 1 -Troubleshooting P0172 and P0175 (Ford 4.6L, 5.4L) lit up by F150leds.com & 5Star tuned.... ---------- If that doesn't get u going. Leme know. There are more options. Good luck lit up by F150leds.com & 5Star tuned....

So i definitely think I have a leak on my passenger side (exhaust manifold). I can almost hear the whistling air. How hard is it to fix that up?

[Jersey_Joe]

So i definitely think I have a leak on my passenger side (exhaust manifold). I can almost hear the whistling air. How hard is it to fix that up?

Well. U can tack weld it in place. I've done that before. It will not look pretty but it will do the job. "Only if it is the manifold". If it's the gasket. U need to remove the manafolds and replace the gaskets. Now. With that being said. Might as well throw headers on if your gonna pull the manafolds and replace them lol

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