Codes

Reply Subscribe

Thread Tools

Search this Thread

Dec 12, 2009 | 06:51 PM

bearbrew

Thread Starter

Driver

Joined: Sep 2009

Posts: 123

Likes: 2

From: OK

Codes

The other day I was able to get a code check on my 2000 RX300. The codes displayed are P0125, P1130 and P1135.
Do I need to replace both Fuel Air Ratio Sensors and the O2 Sensor or can I just replace the Air Fuel Ratio Sensors, reset the code reader, and see what happens?
From what I have been able to read the A/F Ratio Sensor is either Lexus P/N 89467-48011 or Denso P/N 234-9009. The O2 Sensor is Lexus P/N 234-4215 but I do not have the Denso P/N.

Thank you for any help available.

Bearbrew

Dec 13, 2009 | 07:58 AM

Lexmex

CL Community Team

Joined: Apr 2004

Posts: 17,329

Likes: 210

From: Miami, Florida

Quote:

Originally Posted by bearbrew

Yes, the 234-9009 is the one for either of the two upstream a/f sensors coming off the exhaust manifold. The O2 sensor (one after the main cat below the vehicle) most likely will not need replacement. The O2 sensor also is not critical to the function of the vehicle, just it's emissions, so it can be looked at later if either one or both of the a/f sensors need replacement.

For now, go ahead and reset the code reader and see what happens.

With the Elmscan5 Compact I just got, I am able to read the values on the sensors and do get A/F sensors myself (given my RX's modifications), but they come and go, but I can see where the values are way off or on target. But if your scanner can't read these, best to reset and see if these codes come back or not.

Dec 14, 2009 | 06:49 AM

bearbrew

Thread Starter

Driver

Joined: Sep 2009

Posts: 123

Likes: 2

From: OK

Codes

Today I will reset the codes and see what happens. If the codes reappear I will replace the Fuel Air Ratio Sensors.
The P0125 code has me concerned. Perhaps it will be corrected by replacing the A/F Ratio Sensors.

Thank you for the information,

Bearbrew

Dec 14, 2009 | 07:14 AM

JAB

Instructor

Joined: Jan 2006

Posts: 1,016

Likes: 22

From: Virginia

I was in your situation, but with the Bank 2 a/f sensor. If I were you I would clear the codes and wait for them to reappear. Assuming that you get at least the 1130/1135 then replace the Bank 1 sensor only; its the one closest to the firewall. I predict that once that is done the 125 code will not reappear.

Dec 14, 2009 | 07:48 AM

bearbrew

Thread Starter

Driver

Joined: Sep 2009

Posts: 123

Likes: 2

From: OK

From what I have read, here on the forum, that sound like the way to go. As has been stated, the back manifold sensor gets more heat and is the one most likely to be the problem.

Bearbrew

Dec 14, 2009 | 08:20 AM

bearbrew

Thread Starter

Driver

Joined: Sep 2009

Posts: 123

Likes: 2

From: OK

Codes

Just completed the order for a Denso A/F Ratio Sensor, P/N 234-9009, from Amazon.com. Their price was $119.76 which is a lot better than any other place I could find.

Bearbrew