How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask vwnewton Your Own Question
vwnewton, VW Owner,ASE Master and L1 Advanced
Category: VW
Satisfied Customers: 307
Experience:  25 years of VW obsession turned into a job, last 15 years as a VW Tech.
Type Your VW Question Here...
vwnewton is online now
A new question is answered every 9 seconds

I keep getting the code P1128 which is too lean of fuel.

Customer Question

I keep getting the code P1128 which is too lean of fuel. Cylinders 1 & 2 are misfiring too. I changed the fuel filter which did have some ristance to flow. I just checked the fuel pressure and it is at 32psi. The book says 39 psi is the standard. Is 32 too low?
Submitted: 8 days ago.
Category: VW
Expert:  Wolfgang replied 8 days ago.

Thanks for choosing Just Answer . I'm Wolfgang here to help!!

I am confident we can resolve your problem together. Please
understand that I don't know your skill level. In most cases when you have a problem
with the way the vehicle performs, specialized tooling is required to acquire computer
data/information or engine testing results. We didn’t build these complicated vehicles; we
just diagnose and fix them. Also understand that I can't see, smell, hear, or touch the
vehicle either, so it may take a few replies to get to satisfactory results. Note there may be an issue where the complexity of the issue will require a Premium Service. This service will be an addition to the normal question cost. Usually it does not come down to this but keep in mind!! I am also going to direct you with the fastest, easiest and most common things to check first. Please be
patient and permit me to do what I do best.
I also try to give all of the information you may need, expecting a “positive rating” in
return. I will also continue assisting you after you have rated me, if necessary. If there
is any reason I cannot get a positive rating, please let me know why “in advance”, so I
can go another direction for you. I am sorry you’re having this problem; I’ll help you
through it.
Below is my first answer or request for more information. If you do not understand it, or you need more information from me, or need me to go in more detail.

i do need to know what scan tool you have . make and model please.


Customer: replied 8 days ago.
the one i usually use is in my wife's car so i used another one which is Blusmart U581, Memoscan. It is an off brand.
Customer: replied 8 days ago.
I get the same codes on my better unit too.
Expert:  Wolfgang replied 8 days ago.

the reason i ask is that i do need to see some measured values of the vehicle while running to make an narrowing decision of what needs to be replaced.

VAG COM / VCDS has that capabilities.

Expert:  Wolfgang replied 8 days ago.

do you have capabilities to read the mass air flow sensor and o2 readings?