I just these codes from my 96 a4 2.8 v6 quattro

P0116
P0156
P0136
P0302
P0303
P0300

Anyone have any insight?

 

i know p0300 is random misfire, p0302-3 is misfire cylinder 2-3

16500 P0116 Engine Coolant Temperature Circuit - Range/Performance Problem A
16520 P0136 O2 Sensor Circuit - Malfunction (Bank 1 Sensor 2) A
16540 P0156 O2 Sensor Circuit - Malfunction (Bank 2 Sensor 2) A

 

does this look like a fix-it-yourself job or a take-it-to the shop job?

 

p0300 - Random/Multiple Cylinder Misfire Detected
p0302 -Cyl.2 Misfire Detected
p0303 -Cyl.3 Misfire Detected

try to change coils or spark plugs not sure which one

 

not sure on the 2.8l

if the coil packs are similar to the 1.8t i would say you can eliminate p0300-p0303 with buying new coil packs. pretty easy, other codes i am not sure. I bet someone with tech experience could get you in the right direction. sorry i am of no other help

 

A missfire will cause 02 sensor/cat codes because unburnt fuel is going into the cats and causing freakish readings. Definately check/replace plugs first. Swap the coil packs around to see if the codes follow the coil packs before buying new ones.

 

sounds like P0116 could be the cause code says coolant thermostat - poor connection - wiring - ECT sensor the stat is the first on the list