New purchase - '96 C4S...and a question
05-11-2016, 12:34 PM
#1
Track Day
Thread Starter
New purchase - '96 C4S...and a question
My wife was pleased to have Intercity show up during lunch on Mother's Day. Very happy with the purchase so far and greatly appreciate all of the knowledge on RL - it helps answer questions and increases my neuroses all at the same time.
Quick question: from my PPI, I have two lazy O2 sensors but I can't figure out from my searching on which side they are located. Fault codes (22 and 23) are described as being before and after the cat. I'll likely change all four sensors but just curious..
Quick question: from my PPI, I have two lazy O2 sensors but I can't figure out from my searching on which side they are located. Fault codes (22 and 23) are described as being before and after the cat. I'll likely change all four sensors but just curious..
05-11-2016, 02:04 PM
#4
RL Community Team
Rennlist Member
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Lazy meaning slow to heat up into operating range?
The 993 has four oxygen sensors. The sensors measure oxygen content before and after the two catalytic converters and are integral to the emissions and mixture adjustment functions of the engine. They only work properly when heated up. Over time they accumulate deposits that slows the time it takes to warm into their operating range. After X number of start-ups where the time to heat was in excesses of Y seconds the OBDC system will light the check engine light and present an oxygen sensor slow to respond code. Not very surprisingly, this seems to happen to most owners in the fall when the weather is a little cooler and the sensor warm up period is extended by a few seconds. The fix involves simply clearing the code and seeing if it comes back any time soon. Think of the money you will save by not unnecessarily replacing all four of your sensors over several years. At some point you may receive an OBD Code indicating the sensor is dead. At this point it needs to be replaced. My 96’ still has three of its original four sensors and I think I may have had to clear the slow code once or twice in all these years. By the way replacing a sensor in most cases is a very easy DIY job.
The 993 has four oxygen sensors. The sensors measure oxygen content before and after the two catalytic converters and are integral to the emissions and mixture adjustment functions of the engine. They only work properly when heated up. Over time they accumulate deposits that slows the time it takes to warm into their operating range. After X number of start-ups where the time to heat was in excesses of Y seconds the OBDC system will light the check engine light and present an oxygen sensor slow to respond code. Not very surprisingly, this seems to happen to most owners in the fall when the weather is a little cooler and the sensor warm up period is extended by a few seconds. The fix involves simply clearing the code and seeing if it comes back any time soon. Think of the money you will save by not unnecessarily replacing all four of your sensors over several years. At some point you may receive an OBD Code indicating the sensor is dead. At this point it needs to be replaced. My 96’ still has three of its original four sensors and I think I may have had to clear the slow code once or twice in all these years. By the way replacing a sensor in most cases is a very easy DIY job.
05-11-2016, 02:18 PM
#5
Track Day
Thread Starter
Lazy meaning slow to heat up into operating range?
The 993 has four oxygen sensors. The sensors measure oxygen content before and after the two catalytic converters and are integral to the emissions and mixture adjustment functions of the engine. They only work properly when heated up. Over time they accumulate deposits that slows the time it takes to warm into their operating range. After X number of start-ups where the time to heat was in excesses of Y seconds the OBDC system will light the check engine light and present an oxygen sensor slow to respond code. Not very surprisingly, this seems to happen to most owners in the fall when the weather is a little cooler and the sensor warm up period is extended by a few seconds. The fix involves simply clearing the code and seeing if it comes back any time soon. Think of the money you will save by not unnecessarily replacing all four of your sensors over several years. At some point you may receive an OBD Code indicating the sensor is dead. At this point it needs to be replaced. My 96’ still has three of its original four sensors and I think I may have had to clear the slow code once or twice in all these years. By the way replacing a sensor in most cases is a very easy DIY job.
The 993 has four oxygen sensors. The sensors measure oxygen content before and after the two catalytic converters and are integral to the emissions and mixture adjustment functions of the engine. They only work properly when heated up. Over time they accumulate deposits that slows the time it takes to warm into their operating range. After X number of start-ups where the time to heat was in excesses of Y seconds the OBDC system will light the check engine light and present an oxygen sensor slow to respond code. Not very surprisingly, this seems to happen to most owners in the fall when the weather is a little cooler and the sensor warm up period is extended by a few seconds. The fix involves simply clearing the code and seeing if it comes back any time soon. Think of the money you will save by not unnecessarily replacing all four of your sensors over several years. At some point you may receive an OBD Code indicating the sensor is dead. At this point it needs to be replaced. My 96’ still has three of its original four sensors and I think I may have had to clear the slow code once or twice in all these years. By the way replacing a sensor in most cases is a very easy DIY job.
05-11-2016, 02:30 PM
#6
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05-11-2016, 03:26 PM
#8
Rennlist Member
Beautiful car, congrats! This thread may prove helpful in pinpointing your problem, but you need more data in be fault codes. http://forums.pelicanparts.com/porsc...placement.html
05-11-2016, 03:38 PM
#9
Track Day
Thread Starter
Beautiful car, congrats! This thread may prove helpful in pinpointing your problem, but you need more data in be fault codes. http://forums.pelicanparts.com/porsc...placement.html
05-12-2016, 01:25 PM
#10
Rennlist Member
Congrats on the purchase, you have good taste !
Fault codes (22 and 23) is Ageing of the O2 sensors before and after the Catalytic converter from cylinders 4-6
so it is the two O2 sensors on the passenger side of the car.
here is all the error codes for ref
and the site is full of 993 stuff info
http://www.pcarworkshop.com/images/b...28text%29_.pdf
Fault codes (22 and 23) is Ageing of the O2 sensors before and after the Catalytic converter from cylinders 4-6
so it is the two O2 sensors on the passenger side of the car.
here is all the error codes for ref
and the site is full of 993 stuff info
http://www.pcarworkshop.com/images/b...28text%29_.pdf
05-12-2016, 05:16 PM
#11
Track Day
Thread Starter
Thank you! Exactly what I needed.
05-12-2016, 07:39 PM
#12
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