"Warm up catalyst efficiency below threshhold" CEL
07-12-2007, 09:15 AM
#1
AudiWorld Super User
Thread Starter
"Warm up catalyst efficiency below threshhold" CEL
This is the info I get with my ongoing yellow light. Is there an ecu reflash, or am i looking at 02s and cats? thanks
07-12-2007, 10:26 AM
#2
AudiWorld Senior Member
Re: "Warm up catalyst efficiency below threshhold" CEL
search "lunch meat" It could be that your secondary air injection system is not delivering air to the cats on startup. Often times it is just a simple little vacuum hose that has come loose on the top driver's side of the engine which prevents a diaphragm from opening to allow the air to feed the cats.
07-12-2007, 11:04 AM
#3
AudiWorld Super User
Thread Starter
Re: "Warm up catalyst efficiency below threshhold" CEL
Thx but mines a 99, lunchmeat is 2000 and newer apparently.... will still look into it tho so thx and u got any other ideas?
07-12-2007, 03:17 PM
#6
AudiWorld Super User
Thread Starter
Re: steady CEL light? If so, most likley o2 sensors. If original, good thing to do anyway.
We logged it, one o2 sensor is pretty dead throughout the warmup of the car. My tech is cool tho, he doesn't replace pricey cats first like a dealer would, he waits it out til we know for sure what's broken.
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