2012 mazda 6 – P0172:00-ac and P0172:00-af.

[tull_rules]

Make

Mazda

Model

6

Year

2012

Miles

98000

Engine

2.5L

2012 mazda 6 – P0172:00-ac and P0172:00-af. Chk Eng light “system too rich”. Have had tranny flush,replaced-egr/maf/map/air filter, cleaned throttle body. Also have blinking “D” light. Get hesitation/herky jerky at times

 

[billr]

OK pros (Nick, Dan, Dave, GRC), I have lured this one over from TroubleCodes. Now strut your stuff and show how helpful we can be here!

PS: I expect one of the first tests they will want is reading fuel pressure, with a gauge.

PPS: confirm it is P0172 and not P0171 (P0171 was mentioned in the TroubleCodes comment).

 

[tull_rules]

Thank you everyone in advance. I am not very knowledgeable but I am starting to learn. I welcome any suggestions

 

[billr]

Are you confirming there is only the P0172, no P0171?

 

[grcauto]

Regardless it's a fuel code whether lean or rich we want the fuel pressure.
Do you have a gauge and know how to do it?

 

[tull_rules]

Only P0172. I no not have any tools

 

[tull_rules]

Except Forscan which i use to read /clear codes

 

[billr]

No tools at all, not a DIYer? Who changed all those parts, a friend or shop? Do you want to become a DIYer? If not, we will still try to help you learn enough to not be "helpless" when dealing with a shop; but the nature and scope of our questions will change. Any competent shop should need little tech help.

If you do want to check fuel pressure, then a FLAPS (Friendly Local Auto Parts Store) will loan/rent the gauge. Now I gotta check to see if this engine is GDI...

 

[nickb2]

Also have blinking “D” light.

This a problem. Mazda uses ford algorithm.

I am only going on what you wrote.

ranny flush,replaced-egr/maf/map/air filter, cleaned throttle body. Also have blinking “D” light. Get hesitation/herky jerky at times

Stop throwing parts at car and suspect vacuum leak.

 

[nickb2]

Hint, these mazda jobs like breaking the inlet air tube. Look for crack there after MAF sensor.

A crack there will give all the symptoms you have.

Now, you are chasing a rich AND lean code. Sherlock holmes theory applies here. You CaNNOT BE RICH AND LEAN at same time

@billr, I notice you are being carefull. The 2.5l mazda was not a gdi.

 

[nickb2]

Something is upsetting the fuel air ratio, only thing that do that are vacuum leaks, or un metered air which MAF cannot see.

 

[billr]

Nick, why are you saying lean? I may have confused things there. The OP is only reporting P0172.

Are you sure about the no GDI? My brief research indicates some 2.5 engines in that car were GDI.

 

[nickb2]

Also, do not over look PVC valve. it will collapse, I hope I wrote that word right.

I have seen multiple time, under intake, the short hose that goes there will deteriorate. This also creates multiple codes.

Since you have a forscan, it SHOULD have live data, unless it is just a code reader. For that, I can only show in PM how to access that.

 

[nickb2]

yes, you are right, just rich code, sorry, typing too fast. still goes to what I am saying,

QA for this guy, does he hear a whistling sound at idle?

I know for a fact, these japan jobs love intake vac leaks on cyl #1 close to alt, and pvc hose also. metered air is essential for these japan jobs.

,

 

[nickb2]

From what I know, only the 2.0l is a gdi variant.


So I can only quote wiki pedia at this point, the 2.5l is NOT a gdi.