P2097 is a generic OBD II code, which means that it has the same meaning for the Audi A4 as it would any other vehicle. It specifically indicates that your A4 detected that air-fuel mixture reading as the exhaust gas exits the catalytic converter is too rich. (too much fuel for the amount of fuel … Read more
P2098 is a generic OBD II code. It specifically indicates that your A4 detected a lean condition after the catalytic converter (too much air for the amount of fuel present). P2098 Definition This particular code is generic, so it has the same meaning for your Audi A4 as any other vehicle. There are three parts … Read more
U0073 Definition: Control Module Communication Bus”A” Off U0073 is a fairly common trouble code. It is generic, so it has the same meaning for your Audi A4 as it would any other. This code appears when something has interrupted the communication between two of your A4’s control modules. The most common causes of U0073 are … Read more
P2276 is a general diagnostic trouble code. It means that your Audi A4’s third (from the exhaust manifold) “bank 2” downstream oxygen sensor (behind the catalytic converter) is continuously sending voltage that indicates a lean air/fuel mixture. Having this code does not necessarily mean that the vehicle is running lean (although it can, but … Read more
P2274 in the Audi A4 is a general diagnostic trouble code. It means that the “bank 1” oxygen sensor (third oxygen sensor from the exhaust manifold, behind a catalytic converter) is continuously sending voltage that indicates a lean air/fuel mixture. This does not necessarily mean that the vehicle is running lean (although it can, … Read more
P2018 is a generic diagnostic trouble code (DTC) that indicates an issue with your Audi A4’s intake manifold runner position sensor/valve (from here on out, we will be referring to this sensor by its common abbreviation of IMRC). P2018 Definition: IMRC – Switch Circuit Intermittent (Bank 1) IMRC The IMRC’s job is to help your A4’s … Read more
P0356 is a generic OBD II diagnostic code that indicates an issue with the ignition coil “F” (the sixth cylinder). Specifically with the primary or secondary wiring circuits. If your Audi A4 has thrown this code, it will usually be accompanied by P0306. Addressing P0356 should take care of P0306 on its own. P0356 is a … Read more
P0355 is a generic OBD II diagnostic code that indicates an issue with the ignition coil “E”. Specifically with the primary or secondary wiring circuits. If your Audi A4 has thrown this code, it may be accompanied by P0305. P0355 is a relatively straightforward diagnosis and is typically caused by a bad coil pack or wiring harness issue, although … Read more
P2198 is a generic diagnostic trouble code that indicates that your Audi A4’s B2S1 O2 sensor signal is stuck rich. It does not necessarily mean that the vehicle itself is running rich (although it very well could). DTC P2198 is most likely caused by a bad oxygen sensor, although there are many potential secondary causes. … Read more
P2138 is a generic powertrain code that can affect your Audi A4’s “drive by wire” throttle system. It means that your A4’s “D” and “E” throttle position sensors do not agree with one another on how much far the throttle has been opened. They should have a similar voltage output. In this case, they do … Read more