p0170 fuel trim malfunction bank #1?

Asked by Jul 31, 2007 at 01:46 AM about the 1997 Mercedes-Benz E-Class E 320

Question type: Maintenance & Repair

p0170 fuel trim malfunction bank #1

2 Answers

check for vacum leaks,o2 sensor operation,air flow meter reading,this is a lean code

2 of 2 people found this helpful.
65

you really need to look at actual values to be certain what is going on. Look at fuel trim part load and fuel trim idle. If they are going in opposite directions, in other words, richening in part load and leaning in idle, this is a dead give away of a bad MAF sensor. Replace with new Bosch unit specific for the car. People will try to sell you on an insert,at a cheap price, but this insert is actually taken out of a VW Sensor (the wire harness will connect, but you will notice that the lock tabs are wrong, this was done on purpose, I have heard it all usually the claim is it is for a European car). Bosch does not officially supply an insert. Each insert is calibrated to the size of the housing, VW being much smaller, the fuel trim will be off, it will work but in my opinion not the correct way to fix. I am a Bosch Authorized Service Center, so I know what I say is true. Spring for the extra money and fix it right.

Your Answer

Mercedes-Benz E-Class Experts

  • #1
    Tom Demyan
    Reputation
    2,170
  • #2
    dandyoun
    Reputation
    1,930
  • #3
    bobkat
    Reputation
    1,410
View All

Related Models For Sale

Used Mercedes-Benz C-Class
603 Great Deals out of 23,245 listings starting at $1,995
Used Mercedes-Benz S-Class
144 Great Deals out of 5,883 listings starting at $2,000
Used BMW 5 Series
461 Great Deals out of 16,477 listings starting at $2,000
Used BMW 3 Series
1,024 Great Deals out of 31,335 listings starting at $795
Used Mercedes-Benz M-Class
210 Great Deals out of 5,675 listings starting at $2,500
Used BMW 7 Series
161 Great Deals out of 6,001 listings starting at $2,500
Used Mercedes-Benz SL-Class
55 Great Deals out of 2,693 listings starting at $3,950
Used Audi A6
141 Great Deals out of 6,613 listings starting at $1,700
Used Mercedes-Benz CL-Class
29 Great Deals out of 503 listings starting at $3,300
Used Mercedes-Benz CLK-Class
37 Great Deals out of 1,206 listings starting at $1,500

Used Cars For Sale

2018 Mercedes-Benz E-Class For Sale
1,616 listings starting at $54,645
2017 Mercedes-Benz E-Class For Sale
62 Great Deals out of 6,296 listings starting at $39,917
2016 Mercedes-Benz E-Class For Sale
27 Great Deals out of 1,031 listings starting at $27,995
2015 Mercedes-Benz E-Class For Sale
56 Great Deals out of 1,441 listings starting at $18,950
2014 Mercedes-Benz E-Class For Sale
79 Great Deals out of 2,574 listings starting at $18,980

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.