100% Free

No Scanner Needed

Carly logo
Prices

patriciajohnson6

Lexus RX knock sensor issue

Hi, I have a 2005 Lexus RX, gasoline engine, with a check engine light. Mileage is at 123821 km. I've noticed higher fuel consumption and some uneven idling. I suspect it's the knock sensor. Could be a bad connection at the cable or plug? Anyone seen this before?

Summary of the thread

A 2005 Lexus RX owner experienced a check engine light, higher fuel consumption, and uneven idling, suspecting a knock sensor issue. The problem was attributed to a potential bad connection at the cable or plug. After consulting with others, it was advised to check the sensor and cable connections. Ultimately, a workshop visit confirmed the knock sensor and corroded cable connector as the culprits, leading to a successful repair and resolution of the issues.

Did this summary help you solve your problem?

4 comment(s)

theresaknight1

Hey, that sounds familiar. I had almost the same symptoms with my old Opel Corsa. Check engine light, rough idle, and the fuel economy went south. I initially thought it was the spark plugs or something, but a friend mentioned the knock sensor. I'm not a mechanic, so what exactly does the knock sensor do anyway? And is it easy to check the cable?

patriciajohnson6 (community.author)

Thanks for the reply! From what I understand, the knock sensor listens for engine knocking and adjusts the ignition timing to prevent damage. I'm wondering if it's worth trying to clean the contacts on the connector first, or if I should just replace the sensor outright.

theresaknight1

Okay, ignition timing makes sense. With my Corsa, I tried cleaning the contacts, but the light came back on after a few days. Honestly, unless you're really comfortable working on cars, I'd recommend taking it to a workshop. I ended up doing that and it saved me a lot of headache. They can properly diagnose it and replace the sensor if needed.

patriciajohnson6 (community.author)

Appreciate the advice! Took it to the workshop, and you were spot on. It was indeed the knock sensor and the cable connector had corrosion. 95€ later, the light's off, the engine's running smooth, and the fuel consumption is back to normal.

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

RX