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 Juan Crespo Your Own Question
Juan Crespo
Juan Crespo, ASE Certified Technician
Category: Chevy
Satisfied Customers: 1526
Experience:  A.S.E. Master Technician, Advanced Level, Emissions - Asian, Domestic, & European
Type Your Chevy Question Here...
Juan Crespo is online now
A new question is answered every 9 seconds

New error codeP0172,P0101 P1101 P1201 I clean MAF and MAP

Customer Question

New error codeP0172,P0101 P1101 P1201
I clean MAF and MAP wit MAP cleaner but persist the problem
Submitted: 1 year ago.
Category: Chevy
Expert:  Juan Crespo replied 1 year ago.

If you look at all those codes together, they seem to be indicating there is unmmetered air going into the engine. There have been reports of PCVs not sealing properly and warped valve covers wreaking havoc with air flow; so, if I were you, I'd start looking at those first, then move on to other areas where air might be coming in like the intake manifold, hoses, etc.

Let me know what you find.

Customer: replied 1 year ago.
OK I will check
Expert:  Juan Crespo replied 1 year ago.


Customer: replied 1 year ago.
I ve checked the PVC valve ,pvc cover. I did not heard any noise. how can I know if the cover is damaged..,...?
Expert:  Juan Crespo replied 1 year ago.

Most of these checks are performed with a smoke machine; if you don't have access to that kind of tool, then you could use a mechanic's stethoscope to go around the valve cover. Other than that, you'd have to remove it and set it upon a flat work bench to check it.