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 out of 2 people think this is 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

Add photo

Related Questions

Search Mercedes-Benz E-Class Questions

Mercedes-Benz E-Class Experts

#1 Tom Demyan
Tom Demyan
Reputation 2,010
#2 dandyoun
dandyoun
Reputation 1,890
#3 bobkat
bobkat
Reputation 1,340
View All

Related Models For Sale

Used Mercedes-Benz C-Class
471 Great Deals out of 28,403 listings starting at $1,499
Used Mercedes-Benz S-Class
131 Great Deals out of 6,525 listings starting at $1,200
Used BMW 5 Series
484 Great Deals out of 15,046 listings starting at $2,499
Used BMW 3 Series
952 Great Deals out of 33,243 listings starting at $1,000
Used Mercedes-Benz M-Class
170 Great Deals out of 5,066 listings starting at $2,980
Used BMW 7 Series
186 Great Deals out of 5,987 listings starting at $2,999
Used Mercedes-Benz SL-Class
43 Great Deals out of 2,981 listings starting at $2,900
Used Audi A6
135 Great Deals out of 6,489 listings starting at $999
Used Mercedes-Benz CL-Class
24 Great Deals out of 582 listings starting at $3,700
Used Mercedes-Benz CLK-Class
35 Great Deals out of 1,345 listings starting at $2,000

Used Cars For Sale

2017 Mercedes-Benz E-Class For Sale
15 Great Deals out of 9,900 listings starting at $44,551
2016 Mercedes-Benz E-Class For Sale
26 Great Deals out of 1,046 listings starting at $30,389
2015 Mercedes-Benz E-Class For Sale
30 Great Deals out of 899 listings starting at $24,995
2014 Mercedes-Benz E-Class For Sale
67 Great Deals out of 2,982 listings starting at $18,475
2013 Mercedes-Benz E-Class For Sale
20 Great Deals out of 593 listings starting at $16,988