Having problems with your 2000 Mercedes-Benz S-Class ?

Fuel trim malfuction - 2000 Mercedes-Benz S-Class

Posted / edited by AnonymousUser on : 06-07-2020

Answers :

You got that discription from where or whom?

Fuel trim comes in two forms

Short Term --- for fuel adjustments on the current start up
& driving trip.

Long Term---for an avg of the last several times out,
& is a factor used to adjust fuel when the engine is cold
& first started

After the thermostat is open & the temp sensor is satisfied,
the computer goes to closed loop & uses the O2 Sensors to
adjust fuel (short term)

You need the codes produced to diagnose the issue
There could be several things that effect fuel trim.

A failing fuel pump,thus low pressure or volume
Worn out O2 Sensors
Worn out and damaged exhaust converter
Any Vacuum Leaks anywhere on any system
Leaking (vacuum) Intake Manifold or Exhaust Leaks
effecting the O2's
Coolant Temp Sensor
Many more I guess

Without the codes & more discription we can only
say it has to be checked out & scan tool data looked at

A simple loose air filter cover from sloppy work, could
upset things,but would effect both sides of engine,as air
in is common to intake,not bank specific
Repair Help & Product Troubleshooting for 2000 Mercedes-Benz S-Class

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