jonathancrystal1

Mercedes B Klasse Fuel Consumption Issue

My 2020 Mercedes B Klasse with a gasoline engine has increased fuel consumption and the check engine light is on There's a hissing sound when I accelerate I suspect an air intake leak The intake hose looks cracked Could this be the cause or should I look at the intake manifold or a vacuum hose

A 2020 Mercedes B Klasse with a gasoline engine experienced increased fuel consumption and a check engine light, accompanied by a hissing sound during acceleration. The suspected cause was an air intake leak, specifically a cracked intake hose. After taking the car to a workshop, the cracked intake hose was confirmed as the issue, and replacing it resolved the problem, normalizing fuel consumption and eliminating the hissing sound.

Did this summary help you solve your problem?

4 comment(s)

Sounds frustrating I had a similar issue with my old Renault Megane Check engine light and all It ended up being a split in one of the vacuum hoses connected to the intake manifold It was like listening to a deflating balloon every time I accelerated High fuel consumption is a classic symptom Did you check the hose running from the throttle body to the intake manifold

Thanks for the insight I haven't specifically checked the vacuum hoses attached to the intake manifold When you say vacuum hoses are we talking about the small thin ones or something more substantial Also did your Renault also have a hissing sound or was it more of a whistling noise

Yeah the small thin ones On the Megane it was a pain to get to And yes it was definitely a hissing sound pretty loud when accelerating Honestly it's probably best to get it properly diagnosed at a workshop They can do a proper smoke test to pinpoint the leak which is much easier than trying to find it yourself

Appreciate the advice I took it to a workshop and you were spot on It was indeed a cracked intake hose They replaced it cleared the check engine light and the hissing is gone Fuel consumption seems back to normal too Total cost was around 100€ Thanks again for your help

rmh_community_comment_box_header

community_crosslink_scanner_headline

community_crosslink_scanner_intro

community_crosslink_scanner_title

community_crosslink_scanner_price

community_crosslink_rmh_headline

community_crosslink_rmh_intro

community_crosslink_rmh_title

community_crosslink_rmh_subtitle

community_crosslink_rmh_brand

MERCEDES

community_crosslink_rmh_model

BKLASSE