Question about 2001 Audi A4
Lots of codes related to the Cat and or O2 sensors P0421 P0431 P0160 P1122 P1140. Yesterday the car wouldn't start. It has has a smell. Not gas, but not far off. Didnt smell like rotten eggs to me, just different. Thoughts?
The codes would appear to be an Oxygen Sensor
problems & Failed Converters,smell or not
Can't smell after all the expensive rare metals have burned off
from over heating for years
Need to find out why they failed
Check for cylinder misfires & fuel trim issues
Posted on Mar 27, 2014
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Posted on Jan 02, 2017
SOURCE: p0431 code on audi allroad 02
Typcally caused by one of the front oxygen sensors or a bad ground associated with these sensors.Replace both front sensors with direct fit type NOT universal, because there may be a cracked wire and the universal sensor does not contain the complete wire harness. Direct fits, are about $20 more than universal fit type.
The O2 sensors have integrated heating elements that bring them up to the proper operating temperature. Code P0431 indicates that the O2 sensor on your driver side catalytic converter is not reaching the proper operating range. The O2 sensors are usually in the $150 range online.
Posted on Jun 30, 2010
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