2003 Mercedes Benz E320 with engine codes P0174

Question

I have a P0171 and P0174 code on my 2003 Mercedes Benz E320. What is the best way to check for an intake leak?

Answer 1

P0171 and P0174 Fuel trim lean

Do a MAF cleaning with a throttle body cleaning. This may help resolve the probelm. When looking fora vacuum leak there is a hose inspect the hose line which can a does crack over time. A good wasy is to use either a carburaot cleaner or brake cleaner and spray at the suspected area and avoiding hot exhaust area, and note any change in idle.

Answer 2

P0171 MERCEDES-BENZ Code - System Too Lean Bank 1
Read more: https://www.autocodes.com/p0171_mercedes-benz.html

P0174 MERCEDES-BENZ Code - System Too Lean Bank 2
Read more: https://www.autocodes.com/p0174_mercedes-benz.html