Codes P0112, P1425 and P1472

Tiny
ADAM COWSERT
  • MEMBER
  • 1999 VOLKSWAGEN JETTA
  • 2.0L
  • 4 CYL
  • 2WD
  • MANUAL
  • 250,000 MILES
I just bought the car listed above and I need help finding out how to fix a p0112, p1425 and a p1472. I think I fixed the four other codes that came up I think. I need help with these last three and would any of these cause my car to stumble on acceleration?
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Friday, March 12th, 2021 AT 11:39 PM

46 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

The P0112 indicates an issue with the air intake temperature sensor. That can cause drivability issues. I attached a pic below showing its location. Check to make sure there are no wiring issues, the connector is tight, and make sure there isn't corrosion in the plug.

Here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-wiring

Let me know what you find or if you have other questions.

Take care and God Bless,

Joe
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Sunday, March 14th, 2021 AT 8:22 PM
Tiny
ADAM COWSERT
  • MEMBER
Now i'm really really upset because I have just replaced my mass airflow sensor, both of the o2 sensors, the fuel filter and my car is still coming up with these codes p1425, p1472, p0102, p0112, p0134, p0135, p0141 and its still stumbling when I accelerate or downshift. When i'm at a stop light it feel like it's lunging forward.
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Thursday, March 18th, 2021 AT 4:06 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

That is more codes than you listed originally. Have you done anything with the air intake temperature sensor? Does the vehicle run any differently since you did all the work? Did you clear the codes and then have them return?

Joe
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Thursday, March 18th, 2021 AT 5:58 PM
Tiny
ADAM COWSERT
  • MEMBER
No I haven't done anything with the air intake sensor, I don't even know where that is and yeah it did run better after I replaced all those things for a day or two. Yeah, I cleared the codes and they keep popping up.
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Thursday, March 18th, 2021 AT 11:08 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
I attached a pic below showing the IAT location. Check to make sure the connector is tight, clean, not corroded, and none of the pins are damaged.

Let me know,

Joe
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Friday, March 19th, 2021 AT 6:54 PM
Tiny
ADAM COWSERT
  • MEMBER
My motor doesn't look like that.
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Friday, March 19th, 2021 AT 11:19 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

It is a 2.0L, correct? That's the only one that was used.

Do me a favor. Take a pic of yours and upload it for me to see.

Joe
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Saturday, March 20th, 2021 AT 9:17 PM
Tiny
ADAM COWSERT
  • MEMBER
Okay, my air filter goes the other way.
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Saturday, March 20th, 2021 AT 9:39 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

Let me know what you find with the sensor.

Take care,
Joe
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Saturday, March 20th, 2021 AT 10:27 PM
Tiny
ADAM COWSERT
  • MEMBER
Well, now I just have three codes that pop up and they are p1472, p1425 and p0102.
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Sunday, March 21st, 2021 AT 1:32 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi Adam.

I attached pics below showing exactly what the new codes mean. Any can cause drivability issues. What I suggest is to first try to find engine vacuum leaks. Here is a link that shows how it's done:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Below are the definitions for the codes. The reason I'm suggesting checking for a vacuum leak is because that can be causing the MAP code. Two of the codes are likely related to a leak.

Let me know what you find.

Joe

See pics below.
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Sunday, March 21st, 2021 AT 6:17 PM
Tiny
ADAM COWSERT
  • MEMBER
My motor doesn't look like that?
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Monday, March 22nd, 2021 AT 7:33 PM
Tiny
ADAM COWSERT
  • MEMBER
Well, I tried using carburetor cleaner and didn't find any leaks.
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Monday, March 22nd, 2021 AT 7:51 PM
Tiny
ADAM COWSERT
  • MEMBER
And the codes that keep popping up are p1425 tank ventilation valve short to ground, and a p1472 evap control system ldp circuit short tk ground and then a p0102 mass or volume air flow circuit low input. So wouldn't that mean that it's in the wiring?
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Monday, March 22nd, 2021 AT 7:54 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
The sensor itself can be bad. If it is related to low input, it could also be a short. As far as the EVAP components, they are certainly indicating a short.

I attached the entire powertrain management schematic below. I had to cut the pics in half to make them readable, but I did overlap them so you can follow them easier.

Here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-wiring

I hope this helps. Let me know if you have other questions.

Joe

See pics below.
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Monday, March 22nd, 2021 AT 8:39 PM
Tiny
ADAM COWSERT
  • MEMBER
I just replaced the mass air flow sensor, twice.
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Tuesday, March 23rd, 2021 AT 8:48 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
The sensor may not be the issue. It could be a connection issue, short, open circuit and so on. Have you checked the wiring and connections?

Joe
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Tuesday, March 23rd, 2021 AT 5:59 PM
Tiny
ADAM COWSERT
  • MEMBER
Yes, I have checked all of the connections.
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Friday, April 2nd, 2021 AT 2:35 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Have you checked the wiring for continuity and condition?
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Saturday, April 3rd, 2021 AT 8:38 PM
Tiny
ADAM COWSERT
  • MEMBER
I have replaced everything that was wrong with the car and I have checked all the wiring, my check engine light will turn off but only for a second. I am completely stumped.
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Sunday, April 11th, 2021 AT 7:15 PM

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