tofu Posted August 6, 2009 Share Posted August 6, 2009 My 01 IS300 CEL came on couple of weeks ago code P0430 Catalyst Eff. below threshold Bank 2. We thought it was the Catalytic so replaced it but after 300 miles or so same code came back on. Any help will be appreciated. Thanx. Quote Link to comment Share on other sites More sharing options...
smooth1 Posted August 6, 2009 Share Posted August 6, 2009 02 sensor needs to be replaced. Make sure you get the Denso's and not Bosch. They aren't to hard to replace. Costs around 60 bucks. Alot more if you have a tech do it for you. Quote Link to comment Share on other sites More sharing options...
tofu Posted August 6, 2009 Author Share Posted August 6, 2009 02 sensor needs to be replaced. Make sure you get the Denso's and not Bosch. They aren't to hard to replace. Costs around 60 bucks. Alot more if you have a tech do it for you. Please tell me which one is 02 sensor. Thank you for all the help. Quote Link to comment Share on other sites More sharing options...
curiousB Posted October 23, 2011 Share Posted October 23, 2011 02 sensor needs to be replaced. Make sure you get the Denso's and not Bosch. They aren't to hard to replace. Costs around 60 bucks. Alot more if you have a tech do it for you. Please tell me which one is 02 sensor. Thank you for all the help. Check for leak in pipe before or after secondary O2 sensor. I had that problem on LS430 and changed parts befoe I got the right answer. Welded pipe leaks shut and all is well. Quote Link to comment Share on other sites More sharing options...
tinh_x7 Posted October 27, 2011 Share Posted October 27, 2011 (I can't find the option to insert attachment.) According to Alldata v10.40: 2001 Lexus IS 300 L6-3.0L (2JZ-GE) Copyright © 2011, ALLDATA 10.40 Page 1Oxygen Sensor: Technical Service BulletinsEngine Controls - Bank 1/Bank 2 O2 Sensor IdentificationENGINEEG015-07Title:ENGINE BANK 1 AND BANK 2 A/F AND02 IDENTIFICATIONModels:'90 -'08 Applicable ModelsJune 28, 2007TSIB UPDATE NOTICE:The information contained in this TSIB supercedes TSIB No. EG010-04. TSIB No. EG010-04 is now obsolete and should be discarded.IntroductionThis service bulletin provides information on the proper identification of engine bank 1 and engine bank 2 for correct A/F sensor and oxygen sensorreplacement.This bulletin contains information that identifies engine bank 1 and engine bank 2 on the following engines: 2GR-FE, 2GR-FSE, 4GR-FSE, 2JZ-GE,1MZ-FE, 3MZ-FE, 1UR-FSE, 3UR-FE, 1UZ-FE, 2UZ-FE, and 3UZ-FE.^ Bank 1 (B1) refers to the bank that includes cylinder No. 1.^ Bank 2 (B2) refers to the bank opposite bank 1.^ Sensor 1 (S1) refers to the sensor that is located before the catalytic converters.^ Sensor 2 (S2) refers to the sensor that is located after the catalytic converters. Quote Link to comment Share on other sites More sharing options...
IanH Posted November 21, 2011 Share Posted November 21, 2011 This is the one under the drivers seat, and I had the same issue. Since i had 140K and just replaced the clutch, so gaskets were new, I didn't believe it was anything to do with leaks. Replacing the CAT with new Y pipe under the floor seems excessive on a 8yr old car, so I used an O2 cheater for $15- 20 Anyway I agree with above 1) check for leaks and gaskets 2) replace O2 Sensor 3) replace CAT or O2 cheater Quote Link to comment Share on other sites More sharing options...
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