any ideas about these error codes ??

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Jun 12, 2008 | 12:49 PM

qewani1

Thread Starter

Lead Lap

Joined: Jun 2008

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From: indianapolis

any ideas about these error codes ??

i had checked my lexus LS400 Model 2000 with a computer and i had got these error codes..
P0505 idle control system malfunction

B1421 solar sensor circuit (passenger side)
B1424 solar sensor circuit (driver side)

please help me with the meaning of these codes and how to fix these errors??

Jun 12, 2008 | 06:32 PM

VVT-i

Lexus Champion

Joined: May 2002

Posts: 2,781

Likes: 6

From: Georgia

Don't worry about the solar sensor circuit. All Lexus cars have these codes, even the brand new LS600hl. Plus, you can't clear the codes. Just ignore it.

Jun 12, 2008 | 07:33 PM

RTIS250

Yes. I drove the LFA.

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From: Lexus

Yep, 100% normal.

Jun 13, 2008 | 03:58 PM

VVT-i

Lexus Champion

Joined: May 2002

Posts: 2,781

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From: Georgia

Sorry, I didn't see the P505 Idle control circuit. Most of the time this code mean your throttle body goes bad and won't idle.

Jun 13, 2008 | 11:45 PM

RTIS250

Yes. I drove the LFA.

iTrader: (9)

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From: Lexus

Quote:

Originally Posted by VVT-i

Sorry, I didn't see the P505 Idle control circuit. Most of the time this code mean your throttle body goes bad and won't idle.

Wow, i completely missed that too. Nuum is right, usually its a bad throttle body. The little motor that controls the throttle blade goes bad sometimes. Unfortunately, a new throttle body is $1000+...

Dec 12, 2008 | 03:03 AM

qewani1

Thread Starter

Lead Lap

Joined: Jun 2008

Posts: 421

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From: indianapolis

Solved the P0505 idle control system malfunction, it was also giving idle problem while AC is on and car on Parking gear (P). It was just all about cleaning the throttle body by cleaner.
http://images.google.ae/images?hl=ar...-8&sa=N&tab=wi
My TB was full with carbon LOL, but now its clean & clear. It is easy job.

Feb 24, 2014 | 02:47 AM

LCAN

Driver School Candidate

Joined: Feb 2014

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From: Laos

Great tip! I didn't get a P0505 but did get tge B1421 & B1424 solar sensor codes. I will clean the Throttle Body and see if this solves the irratic idle speed. Thanks for the info.
LCAN