error code P0170 fuel trim bank 1

2001 VOLKSWAGEN JETTA
88,000 MILES
Avatar
SOONERGIRL1422
  • MEMBER
  • 1 POST
so i have a 2001 volkswagen jetta wolfsburg. and at the beginning of the month my engine light came on. after getting it scanned it read P0170 fuel trim bank 1. after googling the causes of this code we replaced a rotted vacuum hose and cleaned the MAF sensor. then went and got the code cleared. now 3 weeks later it came back on reading the same error code. P0170 fuel trim bank 1. do you by chance know anything about this code??
Nov 22, 2011 at 9:46 PM
Advertisement
Avatar
RIVERMIKERAT
  • ✓ASE Certified Mechanic
  • 6,110 POSTS
  • ASE Certified Mechanic
When was the last time you put injector cleaner through it?

Check the O2 sensor fuse, number 39 in the attached image. Check the ground connection for the O2 sensor. Measure resistance between pins 1&2 of the sensor.

All the other O2 sensor tests my reference lists requires the VW tester.
Image (Click to enlarge)
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Nov 22, 2011 at 10:00 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.