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 Mercury Grand Marquis as it would any other. This code appears when something has interrupted the communication between two of your Grand Marquis’s control modules. The most common causes of … Read more
P2276 is a general diagnostic trouble code. It means that your Mercury Grand Marquis’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, … Read more
P2274 in the Mercury Grand Marquis 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 … Read more
P2018 is a generic diagnostic trouble code (DTC) that indicates an issue with your Mercury Grand Marquis’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 … 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 Mercury Grand Marquis has thrown this code, it will usually be accompanied by P0306. Addressing P0356 should take care of P0306 on its own. P0356 is … 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 Mercury Grand Marquis 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, … Read more
P2198 is a generic diagnostic trouble code that indicates that your Mercury Grand Marquis’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 … Read more
P2138 is a generic powertrain code that can affect your Mercury Grand Marquis’s “drive by wire” throttle system. It means that your Grand Marquis’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, … Read more
P2196 is a generic diagnostic trouble code that indicates that your Mercury Grand Marquis’s first oxygen sensor on bank one is stuck rich. It does not necessarily mean that the vehicle itself is running too rich. This code is the opposite of code P2195, which indicates the oxygen sensor is stuck lean. P2196 Definition: Oxygen … Read more
P2135 is a generic powertrain code that can affect any make or model of vehicle that has a “drive by wire” throttle system (almost every vehicle made today). P2135 TPS Switch “A/B” Voltage Correlation If your Mercury Grand Marquis has P2135 it is considered “drive by wire”. Which means that it uses sensors and actuators to … Read more