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		Toyota Nation Forum : Toyota Car and Truck Forums > Toyota Passenger and Sports Car Forums > Corolla Forum > 7th Generation (1993-1997)
Code 21

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7th Generation (1993-1997) Specific discussion of the 7th generation

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02-11-2011, 07:35 PM	#1 (permalink)
celicorolla New TN User Join Date: Feb 2011 Location: South Jersey Posts: 5 Gameroom cash: $5900 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Score: 0 reviews	Code 21 My CEL is on. I'm gettin a code 21 from an OBD-I. Correct me if I'm wrong, but I think that's the main oxygen sensor? Can anyone tell me what the most common problems are that would cause the code?

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02-11-2011, 08:32 PM	#2 (permalink)
BoyYota Official TN Member Join Date: Feb 2010 Location: Tampa Posts: 441 Gameroom cash: $138400 Thanks: 49 Thanked 47 Times in 46 Posts iTrader Score: 0 reviews	Check it out Corolla 93 OBD-I to OBD-II conversion O2 sensor is probably toast. __________________ 94 Prizm LSi 1.8. Auto and still quick as hell.

02-12-2011, 01:02 AM	#3 (permalink)
celicorolla New TN User Join Date: Feb 2011 Location: South Jersey Posts: 5 Gameroom cash: $5900 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Score: 0 reviews	Thanks man, I appreciate it. I'll let you know when I figure out the problem.

02-12-2011, 09:10 AM	#4 (permalink)
speedy25 Andele, andele! Join Date: Aug 2009 Location: NE oHIo Posts: 1,337 Gameroom cash: $235545 Thanks: 0 Thanked 84 Times in 83 Posts iTrader Score: 0 reviews	I've found that you can "revive" an O2 sensor by wire brushing it. They still suffer from wear and tear and will need replacement, but often the shroud around the sensor gets clogged by deposits and cant read correctly. -SP

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