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allan911 replied to petes's topic in 996 Series (Carrera, Carrera 4, Carrera 4S, Targa)My problem turned out to be a bad bulb. the two filament tail ight bulbs, one of them had one filament burned out. I replaced that bulb and voila, problem fixed!
allan911 replied to TJH's topic in 996 Series (Carrera, Carrera 4, Carrera 4S, Targa)Loren, It was a bad tail light/brake light. I actually had two lights out, the small bulb and the two filament bulb (had one filament burnt out). It was the two filament bulb that was the problem. once I replaced it, the ABS and PCM warnings do not come on. WOO HOO! a $5 fix! (can't say that very often) Mark
allan911 replied to petes's topic in 996 Series (Carrera, Carrera 4, Carrera 4S, Targa)My 2002 C4 just started having a similar problem. Every time I switch on the headlights, the ABS & PSM warning lights come on. I turn off headlights, re-start and the warning lights disappear and never come on (until I switch on headlights). I assume it is a light problem, not a PSM/ABS problem.
allan911 replied to TJH's topic in 996 Series (Carrera, Carrera 4, Carrera 4S, Targa)I have a 2002 Carrera 4. when I turn the headlights on the PSM and ABS warning lights come on. I haven't checked to see if any tail or brake lights are not working, but it sounds like that may be the problem. When I turn the lights off and re-start my car, the warning lights disappear and never come back on.
:clapping: For everyone's information who might need help passing an emissions test on a Porsche 911. :clapping: I FINALLY PASSED! (after failing 3 times). I changed the O2 sensor, changed the oil, changed the air filter and re-set the fuel selector switch in the DME (accessible from the outside) to position #3 (lean). The previous test was 1.85 PPM CO (1.2 PPM allowable), after the modifications, the last test came back at 0.7 PPM. I also tested in the cool morning (60F) versus 85F - 90F to help increas air density (and improve air/fuel ratio at 5700' elevation). thanks for the help :clapping:
I am located in Denver, Colorado. I have driven the car twice since installing the new O2 sensor (and plugging it in correctly). I just failed the third emissions test registering 1.8 PPM CO. Plugging in the O2 sensor definitely helped, but I am still not making the maximum 1.2 PPM CO allowable. The car passed Nevada emissions with flying colors, but can't seem to make the CO test here at 5700' elevation. If anyone out there knows a trick to pass CO emissions in Denver, please let me know. The HC levels were low at both idle and 2500 RPM, NOX was fine as well. thanks
So, if I understand you correctly, even though I may not have had the O2 sensor plugged in, the CEL might not have come on. Being that my O2 reading went from 1.7 PPm to 2.7 PPM, I am thinking that the O2 sensor was not working. Do you have any other suggestions to get my emissions test in compliance? BTW, I have since plugged the O2 sensor in and the car is running MUCH better. thanks, Mark
One more question regarding the O2 sensor. If the O2 sensor is not completely plugged in will a warning light come on? It was pretty difficult plugging the new sensor back into the plug and I am not 100% positive I got all three contacts plugged in. I forgot to take a picture of the plugg assembly before I unplugged it to remove the old O# sensor. The car has only 58k miles. thanks for your help :help:
:help: :help: I have failed TWo emissions tests (in Denver) for CO for my 1990 C4. This car passed with a zero CO in Nevada two months ago. My first test (at 2500 rpm) was 1.70 PPM CO (1.2 is maximum allowable), then I changed oil, changed the O2 sensor (Bosch Porsche replacement) and changed the air filter which was dirty (replaced stock with a K&N) and the second emissions test came back at 2.7 PPM CO!!!. What happened? Car was at operating temperature for second test (hot) and a little cooler for first test. I have also run injector cleaner and Bluesky additive through the car as well. Is there something I need to do to pass CO test at 5600 feet elevation? does the car need to go to a Porsche dealer. I'd appreciate any help, thanks
:eek: Sounds like about a 5 - 6 hour job. Can you tell me exactly where the oxygen sensor is located on a 1990 C4 and the best way to remove and replace it. thanks Most O2 sensors use a special 19 mm slotted socket. Most folks that sell O2 sensors also sell the sockets ($9-$20).