A6 C5 Wont start, no OBD II signal. Help please!
02-15-2018, 05:06 AM
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A6 C5 Wont start, no OBD II signal. Help please!
Hello
So i have driven and loved my A6 -00 1.8T Quattro for some time now, and without any major problems, but last week she gave up on me. Went out to start the car as usual and it cranks but doesn't fire up, no coughs. So i bust out the fault code reader and get codes for both O2 sensor and engine coolant temp (P0118, P0134, P1116). After having gotten the codes i try erasing them in hopes of a starting car to no avail. The day after i go out to check the components with a multimeter and see if i got any new fault codes, this time around when i plug in the ODB II reader it doesn't start up (no its not the reader, i have checked) so now I have 2 problems, car won't start and I cant get any more fault codes...
Someone please be my saving angel and tell me where to start troubleshooting.
Love the community here so far!
So i have driven and loved my A6 -00 1.8T Quattro for some time now, and without any major problems, but last week she gave up on me. Went out to start the car as usual and it cranks but doesn't fire up, no coughs. So i bust out the fault code reader and get codes for both O2 sensor and engine coolant temp (P0118, P0134, P1116). After having gotten the codes i try erasing them in hopes of a starting car to no avail. The day after i go out to check the components with a multimeter and see if i got any new fault codes, this time around when i plug in the ODB II reader it doesn't start up (no its not the reader, i have checked) so now I have 2 problems, car won't start and I cant get any more fault codes...
Someone please be my saving angel and tell me where to start troubleshooting.
Love the community here so far!
02-16-2018, 07:10 AM
#2
AudiWorld Senior Member
Some suggestions:
Check the fuse for the ODBII port. If this fuse is not working then ODBII port will not work.
Can you hear the electric fuel pump inside the fuel tank running with key in run position? You need to hear the pump otherwise the pump itself or the fuel pump relay could have failed.
Check for fuel pressure at the engine fuel delivery line connection to fuel rail.
One common failure causing engine to turn over but not start is a faulty Crank Position Sensor. There may or may not be a code present for a failed crank sensor depending on the nature of failure.
Check the fuse for the ODBII port. If this fuse is not working then ODBII port will not work.
Can you hear the electric fuel pump inside the fuel tank running with key in run position? You need to hear the pump otherwise the pump itself or the fuel pump relay could have failed.
Check for fuel pressure at the engine fuel delivery line connection to fuel rail.
One common failure causing engine to turn over but not start is a faulty Crank Position Sensor. There may or may not be a code present for a failed crank sensor depending on the nature of failure.
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