Reply With QuoteLift the carpet behind the driver side seat
Rear O2 sensor connector
Short version - where is the connector for the rear O2 sensor?
Long version - I went to get my car inspected, today, and it failed with the P420 code. The CEL wasn't illuminated, or I wouldn't have bothered taking it to the inspection station. (The CEL does illuminate if the ginition is on but the car isn't running, so I know the bulb is there.) I bought an OBD-II scanner from Harbor Freight to read and clear codes, did both, and after another 25 miles, the code hasn't returned.
I back-probed the front O2 sensor connector, and the voltages on my Harbor Freight voltmeter varied back and forth between a minimum near .19 and a maximum near .91; I gather this means the front O2 is good. I was going to backprobe the connector on the rear O2 sensor to see if it was good, but the wires disappear into the body. Where is the connector so I can check voltages to make sure my rear sensor is also okay?
In case it matters, I bought the car a few months ago, (with 170K+ miles) and I think it sat a while prior to my purchase. I have put a few thousand miles on it, already. I think possible cat problems from sitting have since burnt off, hence the MIL ON flag but no CEL, but I am not sure, since I am new to OBDII Miatas, and have only done basic maintenance for a friend on a 91. If I do need a cat, any recommendations for exhaust shops? I would prefer to get a cheap, high flow cat if it won't throw codes, and then I'll have an excuse to re-do my exhaust every few years (when it goes bad) rather than pay through the nose all at once to get the stock cat.
Thanks for the help.
Last edited by Walsted; 11-11-2007 at 10:17 AM. Reason: Wrong values
Mike Walsted - Not an expert, just a data point.
1999 Miata
2003 MIata
1999 Miata
2001 Kia Rio
Lift the carpet behind the driver side seat
Maybe 4 wheels aren't so bad after all... wickett.org
It only goes to show when people can no longer discriminate on the grounds of race, religion, or sexual orientation, they can improvise and still find someone to hate. - Dave Moulton
Thanks. Found it, both sensors are working and matching, so I guess my cat is dead.
Mike Walsted - Not an expert, just a data point.
1999 Miata
2003 MIata
1999 Miata
2001 Kia Rio
Sorry to hear that.Originally Posted by Walsted
Maybe 4 wheels aren't so bad after all... wickett.org
It only goes to show when people can no longer discriminate on the grounds of race, religion, or sexual orientation, they can improvise and still find someone to hate. - Dave Moulton
That sucks, on the 99-05 the cat is integrated into the exhaust mid pipe. That means you can either buy a new performance mid pipe with a cat in it. Or have one welded in. Some shops are a little squeamish about taking out an OEM cat, even if it is dead.
Darn, I left it on the exhaust shop's floor.
Mike Walsted - Not an expert, just a data point.
1999 Miata
2003 MIata
1999 Miata
2001 Kia Rio
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