100% Free

No Scanner Needed

Carly logo
Prices

andreasschroeder8

Lexus IS Turbo Wastegate Issue

Alright Lexus IS owners, I'm pulling my hair out! I've got a 2016 Lexus IS hybrid, and lately, it's been driving me nuts. The check engine light is on, power is way down, and the engine response is terrible. Sometimes, it even stalls at idle! Plus, my fuel consumption has gone way up, and I'm hearing this weird whistling noise, almost like a loud hissing when I accelerate. Any ideas? I suspected a bad MAP sensor, but I don't know where to start. Maybe it's the intercooler? Turbo lag is awful, and I'm worried it's something serious with the boost control.

Summary of the thread

A 2016 Lexus IS hybrid owner is experiencing issues with a check engine light, reduced power, poor engine response, stalling at idle, increased fuel consumption, and a whistling noise during acceleration. These symptoms suggest a potential boost leak, possibly due to a loose clamp, cracked hose, or issues with the wastegate valve. A visual inspection of the turbo system, particularly the hoses and wastegate, is recommended. Ultimately, the problem was identified as a faulty wastegate valve, which was repaired by a mechanic, resolving the issues.

Did this summary help you solve your problem?

4 comment(s)

gertbauer34

Sounds like a boost leak to me. That whistling/hissing noise is a classic symptom. Have you checked all the hoses and connections around the turbo? A loose clamp or a cracked hose could definitely cause reduced power and poor engine response, plus trigger the check engine light. Given it's a hybrid, maybe also check if there are any specific hybrid system codes related to boost. I'd start with a visual inspection before throwing any parts at it.

andreasschroeder8 (community.author)

Thanks for the quick reply! I did a quick visual check, but honestly, I'm not super familiar with the turbo setup on this engine. Any tips on where to look specifically for those boost hoses and connections? I'm kind of a newbie when it comes to turbo issues, so any pointers would be awesome. Are there common failure points I should be aware of?

gertbauer34

Okay, so tracing the boost hoses can be tricky. Start right after the turbocharger outlet and follow the pipes to the intercooler, then from the intercooler to the intake manifold. Pay special attention to any rubber hoses, as they can crack with age and heat. Also, check the wastegate valve and its actuator arm – a defect there can cause all sorts of boost problems. To be honest, with those symptoms, especially the stalling, it could also be a more serious issue with the turbo itself. At 220k km, wear and tear is definitely a factor. You might want to consider getting it checked out by a mechanic with experience in turbo systems; could save you a lot of headache in the long run.

andreasschroeder8 (community.author)

I took your advice and brought it to a local mechanic. Turns out the wastegate valve was indeed the culprit. The repair, including parts and labor, cost me around 860€. Runs like a charm now, thanks a bunch!

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

LEXUS

community_crosslink_rmh_model

IS