The structure of the first digit is as follows
Pxxxx for the transmission
Bxxxx for the body
Cxxxx for chassis
Uxxxx for future systems
Structure of the second digit:
Government codes P0xxx
P1xxx manufacturer’s code for the additional function of the emission system; not required but reported to the government
Structure of the third digit:
Air and fuel measurement Px1xx
Px2xx Air and fuel measurement
Ignition system Px3xx
Additional emission control Px4xx
Transmission and idle Px5xx
Computer and output signals Px6xx
Transmission Px7xx
Transmission Px8xx
Px9xx control modules, input and output signals
Without on-board diagnostic (OBD) system
| Code | Malfunction |
| P0010 | Chain camshaft position Activator (Group 1) |
| P0075 | Damage circuit solenoid inlet valve control (Group 1) |
| P0105 | Damage to the electrical circuit sensor of absolute air pressure |
| P0110 | Faulty air temperature sensor circuit |
| P0115 | Damage to the electrical circuit coolant temperature sensor |
| P0116 | Violation/amplitude characteristics of the coolant temperature sensor |
| P0120 | Damage to the electrical circuit of the throttle position sensor |
| P0130 | Damage to the oxygen sensor circuit (Group 1, sensor 2) |
| P0132 | A high level of oxygen sensor signal (Group 1, sensor 2) |
| P0134 | Low efficiency of oxygen sensor (Group 1, sensor 1) |
| P0135 | Damage to the electrical circuit of the heated oxygen sensor (Group 1, sensor 1) |
| P0196 | Violation/amplitude characteristics of engine oil temperature sensor |
| P0197 | Low engine oil temperature sensor signal |
| P0198 | High engine oil temperature sensor signal |
| P0201 | Damage to the electrical circuit fuel injector cylinder 1 |
| P0202 | Damage to the electrical circuit fuel injector cylinder 2 |
| P0203 | Damage to the electrical circuit fuel injector cylinder 3 |
| P0204 | Damage to the electrical circuit fuel injector cylinder 4 |
| P0230 | Damage to fuel system electrical circuit |
| P0325 | Damage to the knock sensor 1 circuit |
| P0335 | Damage to the electrical circuit the crankshaft angle sensor |
| P0340 | Damage to the electrical circuit the camshaft position sensor (CMP) |
| P0443 | Damage to the electrical circuit of the control valve fuel vapor recovery system |
| P0501 | Violation/amplitude characteristics of vehicle speed sensor |
| P0560 | Violations of the onboard vehicle network |
| P0605 | Violations of the ESM unit self-test |
| P1515 | Wrong adjustment valve control signal at idle (1 Coil) |
| P1516 | Wrong signal valve idling adjustment (Coil 2) |
| P1602 | Consistent communication with transmission control unit (TCU) |
| P1610 | Communication with anti-theft system |
| P1800 | Damage to the immobilizer antenna Smatra |
| P1801 | Damage pulse transponder immobiliser Smatra |
| P1803 | There is no request from the anti-theft system |
| P1805 | Inconsistent data from the anti-theft system |
Audi A3 Diagnostic trouble codes (1.8 / 2.0 I4)
| Code | Malfunction |
| P0010 | Chain camshaft position Activator (Group 1) |
| P0030 | Oxygen sensor heater circuit damage (Group 1, sensor 1) |
| P0036 | Oxygen sensor heater circuit damage (Group 1, sensor 2) |
| P0075 | Damage circuit solenoid inlet valve control (Group 1) |
| P0076 | Low signal in a circuit solenoid inlet valve control (Group 1) |
| P0077 | High signal in the chain of control solenoid inlet valve (Group 1) |
| P0105 | Damage to the electrical circuit sensor of absolute air pressure |
| P0106 | Violation of the absolute air pressure sensor characteristics |
| P0110 | Faulty air temperature sensor circuit |
| P0115 | Damage to the electrical circuit coolant temperature sensor |
| P0116 | Violation/amplitude characteristics of the coolant temperature sensor |
| P0120 | Damage to the electrical circuit of the throttle position sensor |
| P0121 | Violation/amplitude characteristics of throttle position sensor |
| P0125 | Low coolant temperature |
| P0130 | Damage to the oxygen sensor circuit (Group 1, sensor 2) |
| P0132 | A high level of oxygen sensor signal (Group 1, sensor 2) |
| P0133 | Oxygen sensor slow response (Group 1, sensor 1) |
| P0139 | Oxygen sensor slow response (Group 1, sensor 2) |
| P0134 | Low efficiency of oxygen sensor (Group 1, sensor 1) |
| P0135 | Damage to the electrical circuit of the heated oxygen sensor (Group 1, sensor 1) |
| P0136 | Damage to the electrical circuit of the lower oxygen sensor (Group 1, sensor 2) |
| P0140 | Low efficiency of oxygen sensor (Group 1, sensor 2) |
| P0141 | Damage to the electrical circuit of the heated oxygen sensor (Group 1, sensor 2) |
| P0170 | Damage to fuel system (Group 1) |
| P0196 | Violation/amplitude characteristics of engine oil temperature sensor |
| P0197 | Low engine oil temperature sensor signal |
| P0198 | High engine oil temperature sensor signal |
| P0201 | Damage to the electrical circuit fuel injector cylinder 1 |
| P0202 | Damage to the electrical circuit fuel injector cylinder 2 |
| P0203 | Damage to the electrical circuit fuel injector cylinder 3 |
| P0204 | Damage to the electrical circuit fuel injector cylinder 4 |
| P0230 | Damage to fuel system electrical circuit |
| P0300 | Random misfiring |
| P0301 | Misfiring in 1-m cylinder |
| P0302 | Misfiring in 2-cylinder |
Without Onboard Diagnostics (OBD)
| Code | Malfunction |
| P0105 | Damage to the electrical circuit the air flow meter sensor |
| P0112 | Low air temperature sensor signal |
| P0113 | High level air temperature sensor signal |
| P0116 | Damage to the electrical circuit coolant temperature sensor |
| P0117 | Low coolant temperature sensor signal |
| P0118 | High level of coolant temperature sensor signal |
| P0121 | Damage to the electrical circuit of the throttle position sensor |
| P0122 | If signal = low throttle position sensor |
| P0123 | The high signal level of the throttle position sensor |
| P0130 | Damage to the oxygen sensor circuit |
| P0131 | Low oxygen sensor signal |
| P0132 | A high level of oxygen sensor signal |
| P0133 | Oxygen sensor slow response |
| P0134 | Low efficiency of oxygen sensor |
| P0135 | Damage to the electrical circuit of the heated oxygen sensor |
| P0230 | Damage to fuel system electrical circuit |
| P0201 | Damage to the electrical circuit fuel injector cylinder 1 |
| P0202 | Damage to the electrical circuit fuel injector cylinder 2 |
| P0203 | Damage to the electrical circuit fuel injector cylinder 3 |
| P0204 | Damage to the electrical circuit fuel injector cylinder 4 |
| P0326 | Knock sensor circuit damage |
| P0335 | Damage to the electrical circuit the crankshaft angle sensor |
| P0336 | Random failures of crankshaft angle sensor |
| P0342 | Low level signal camshaft position sensor |
| P0343 | High level of camshaft position sensor signal |
| P0501 | Damage to the electrical circuit vehicle speed sensor |
| P0506 | Reduced crankshaft rotation speed at idle |
| P0507 | Increased frequency of rotation of the crankshaft at idling |
| P0562 | Low voltage in the on-board vehicle network |
| P0563 | High voltage in the on-board vehicle network |
| P0606 | Internal damage to the ESM unit |
| P1123 | An enriched fuel mixture |
| P1124 | Depleted fuel mixture |
| P1127 | Long re enrichment fuel mixture |
| P1128 | Long re impoverishment of the fuel mixture |
| P1510 | Always open the valve system idle due to a short circuit of electric power supply circuit valve coils |
| P1513 | Always open the valve system idle due to a breakage of the valve coil power supply circuit |
| P1552 | Permanently closed the valve system idle due to a short circuit of electric power supply circuit valve coils |
| P1553 | Permanently closed the valve system idle due to a breakage of the valve coil power supply circuit |
| P1586 | Not corresponding to the signal received from the gearbox |
| P1610 | Damage to the immobilizer SMATRA |
| P1800 | Damage to the immobilizer antenna |
| P1801 | Damage pulse transponder immobiliser |
| P1803 | ESM signal error |
| P1805 | Damage Of EEPROM |
| P1765 | Damage of the torque reduction circuit |
| Code | Malfunction |
| P0105 | Damage to the electrical circuit the air flow meter sensor |
| P0112 | Low air temperature sensor signal |
| P0113 | High level air temperature sensor signal |
| P0116 | Damage to the electrical circuit coolant temperature sensor |
| P0117 | Low coolant temperature sensor signal |
| P0118 | High level of coolant temperature sensor signal |
| P0121 | Damage to the electrical circuit of the throttle position sensor |
| P0122 | If signal = low throttle position sensor |
| P0123 | The high signal level of the throttle position sensor |
| P0130 | Damage to the oxygen sensor circuit |
| P0131 | Low oxygen sensor signal |
| P0132 | A high level of oxygen sensor signal |
| P0133 | Oxygen sensor slow response |
| P0134 | Low efficiency of oxygen sensor |
| P0135 | Damage to the electrical circuit of the heated oxygen sensor |
| P0136 | Damage to the electrical circuit of the lower oxygen sensor |
| P0137 | If signal = low, lower oxygen sensor |
| P0138 | The high signal level of the lower oxygen sensor |
| P0141 | Damage to the electrical circuit of the heated oxygen sensor |
| P0201 | Damage to the electrical circuit fuel injector cylinder 1 |
| P0202 | Damage to the electrical circuit fuel injector cylinder 2 |
| P0203 | Damage to the electrical circuit fuel injector cylinder 3 |
| P0204 | Damage to the electrical circuit fuel injector cylinder 4 |
| P0230 | Damage to fuel system electrical circuit |
| P0300 | Random misfiring |
| P0301 | Misfiring in 1-m cylinder |
| P0302 | Misfiring in 2-cylinder |
| P0303 | Misfiring in 3-cylinder |
| P0304 | Misfiring in 4-cylinder |
| P0326 | Knock sensor circuit damage |
| P0335 | Damage to the electrical circuit the crankshaft angle sensor |
| P0336 | Random failures of crankshaft angle sensor |
| P0342 | Low level signal camshaft position sensor |
| P0343 | High level of camshaft position sensor signal |
| P0422 | Low efficiency of catalytic converter |
| P0444 | Electrical circuit interruption valve cleaning carbon canisters |
| P0445 | Electrical shorting of the cleaning valve activated charcoal canisters |
| P0501 | Damage to the electrical circuit vehicle speed sensor |
| P0506 | Reduced crankshaft rotation speed at idle |
| P0507 | Increased frequency of rotation of the crankshaft at idling |
| P0562 | Low voltage in the on-board vehicle network |
| P0563 | High voltage in the on-board vehicle network |
| P0606 | Internal damage to the ESM unit |
| P1123 | An enriched fuel mixture |
| P1124 | Depleted fuel mixture |
| P1127 | Long pereobogashhenie the fuel mixture |
| P1128 | Long pereobednenie the fuel mixture |
| P1510 | Always open the valve system idle due to a short circuit of electric power supply circuit valve coils |
| P1513 | Always open the valve system idle due to a breakage of the valve coil power supply circuit |
| P1552 | Permanently closed the valve system idle due to a short circuit of electric power supply circuit valve coils |
| P1553 | Permanently closed the valve system idle due to a breakage of the valve coil power supply circuit |
| P1529 | Damage to the gearbox control unit |
| P1586 | Not corresponding to the signal received from the gearbox |
| P1605 | Damage to the electrical circuit the acceleration sensor |
| P1606 | Not corresponding to the signal received from the acceleration sensor |
| P1611 | Low level input signal lamp MIL |
| P1613 | High level input signal lamp MIL |
| P1610 | Damage to the immobilizer SMATRA |
| P1800 | Damage to the immobilizer antenna |
| P1801 | Damage pulse transponder immobiliser |
