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Audi RR (20V) ur-quattro engine Motronic error codes

3mm male loudspeaker connections are ideal for the ends of the switch and diode leads. Maplins sell "12V" LEDs that already contain a ballast resistor.

Remember that the RR's Motronic 2.4.1 system has a non-volatile memory and is capable of displaying as faults things that have long since been fixed. It is advisable to clear the memory before beginning any debugging work - this is done either by disconnecting the battery, pulling the ECU fuses along the side of the fusebox, or performing the following diagnostic procedure, including the last step.

The longitudinal fuses down the side of the fusebox under the bonnet are NOT spares. Check that any socket with metal contacts in it also has a fuse - especially the rear one. These fuses should have red clip-on covers saying "Moteur" - if one or more is missing, part # 893 941 819 for a few pence will stop anyone else making the same mistake.
Recreate the observed problem via a test drive. The engine should be thoroughly warmed and then accelerated at full throttle in 3rd gear from 35 mph (50 kph), observing local speed limits. The engine should be left running.
(If the engine will not start, it should be spun on the starter for 5 seconds and left with the ignition switched on. In this case, code 2111 should be ignored.)
Diagnostic plugs in right footwell
Engine must be running, or ignition on after five-second run on starter
Diode probe point to upper black, other lead to upper blue
Connect lower black and lower brown for 4 seconds to start sequence - diode must light up. If not, reverse diode leads
Repeat to step through codes
If 0000 is displayed, stepping again clears non-volatile memory

Code	Meaning
1111	ECU defective or incompetently modified
2111	RPM sensor - ignore if engine not successfully started since ignition switched on
2112	Top dead centre sensor
2113	Hall sensor
2121	Idle switch
2132	No data - California
2141	#1 knock sensor
2142	#1 knock sensor
2143	#2 knock sensor
2144	#2 knock sensor
2212	Throttle potentiometer
2214	Max RPM exceeded
2221	Vacuum pressure
2223	Altitude sensor
2224	Max boost exceeded
2231	Idle control defective
2232	Air mass sensor (ECU 447 907 404A)
2234	ECU supply voltage
2312	Coolant temp sensor
2322	Inlet air temp sensor
2324	Air mass sensor (ECU 857 907 404B)
2341	CO content exceeded
2342	Lambda sensor
4411	#1 injector
4412	#2 injector
4413	#3 injector
4414	#4 injector
4421	#5 injector
4431	Idle stabilisation valve
4442	Wastegate frequency valve
4343	Carbon canister frequency valve

There is a more comprehensive discussion of Audi 20V fault codes on Scott Mockry's site.

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