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Check Engine light

Tiny
GRASSCHR
  • MEMBER
  • MERCEDES BENZ
1999 Mercedes SLK230 77,750 mi. 2.3L 5 speed

Check engine light on:
P0170 Fuel Trim Malfunction (Bank 1)
P0440 Evaporative Emission Control System Malfunction

Is this critical? What is the resolution?

Thank you.
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Tuesday, November 6th, 2007 AT 3:04 PM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
P0170 relates to an oxygen sensor where the no.1 cylinder side. You sure its P0170?

Code P0440 could mean one or more of the following has failed

The gas cap is not installed or working properly
The purge solenoid has failed
The canister is plugged and not working properly.
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Tuesday, November 6th, 2007 AT 3:40 PM
Tiny
GRASSCHR
  • MEMBER
  • 2 POSTS
Should I address this immediately?
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Tuesday, November 6th, 2007 AT 3:47 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
You should -you don't want be in no man's land and it decides to act up. Its your shot.
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Tuesday, November 6th, 2007 AT 4:19 PM

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