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#1
10-20-2009, 08:39 AM
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Codes 420 and 755
Hello all, I have a 1996 camry le with 197k on it i recently got a cel and had it scanned. came up with codes 420 and 755. Can anyone tell me what I should look for to fix this problem ? thanks
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#2
10-20-2009, 11:10 AM
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Re: Codes 420 and 755
For a generaic definition of the codes use this site:
http://www.iequus.com/support/obd2_definitions.php Also, the Toyota factory service manuals stickied at the top of this forum's home page will have the troubleshooting charts for each of the codes. Download the generation 4 manual. Here's the link to the manuals: http://www.automotiveforums.com/vbul...d.php?t=497839 Mike
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#3
10-20-2009, 12:02 PM
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Re: Codes 420 and 755
First, delete the codes and see if they reappear. I have had the P0420 code go away and not return after I deleted the code. Same may be true of the P0775 code.
P0420 Catalyst System Efficiency Below Threshold (Bank 1) 1. Check for leaks in the exhaust system between the engine and the cat converter (loose connection, rusted area, or burned out seal) 2. HO2 or A/F ratio sensor before cat converter is bad (remove connector and measure resistance between terminals +B and HT - should be 0.8-1.4 ohms cold). 3. HO2 sensor after cat converter is bad (measure resistance as above - should be 11-16 ohms cold). <= Most likely 4. Cat converter is bad. If you need to replace a sensor, bring your VIN to a Toyota dealer and get the correct part number for your engine. There is only one that works correctly, but at least two available. You don't have to buy the part from Toyota, but you have to have the correct part number. P0755 Shift Solenoid B Malfunction Replacing the fluid in the transmission may help, otherwise you have to replace solenoid B.
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Forum Guidelines:http://www.automotiveforums.com/vbulletin/guidelines.html "What we've got here is a failure to communicate"
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#4
10-21-2009, 01:22 PM
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Re: Codes 420 and 755
If you have the 4-cylinder, definitely check the exhaust header to downpipe connection as suggested by Brian. Leaks here are usually audible. I find those nuts to always be either loose or missing due to the inherent vibrations of the 4-cyl. Loctite helps. The colder weather exacerbates the vibration due to colder rubber in the engine mounts.
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Current Garage: 2009 Honda CR-V EX 2006 Mazda 3i 2004 Chevrolet Silverado 2500HD 2003 GMC Envoy XL 2000 Honda ST1100 2000 Pontiac Sunfire Vehicle History: 2003 Pontiac Vibe AWD - 1999 Acura Integra GS - 2004 4.7L Dakota Quad Cab 4x4 - 1996 GMC Jimmy 4wd - 1995 Chevrolet C2500 - 1992 Toyota Camry LE 2.2L - 1992 Chevrolet S10 Ext. Cab 4.3L - 1995 Honda ST1100 - 1980 Yamaha XS400 - 1980 Mercury Bobcat.
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