This page is meant to help you troubleshoot the Cadillac DeVille P0420 trouble code. It covers the P0420 code’s meaning, symptoms, causes, and possible solutions. P0420 is the most common OBDII code and is virtually never a breakdown risk. A failing oxygen sensor or bad catalytic converter are the most common causes of P0420. Table … Read more
One of the most common trouble codes with the Cadillac DeVille is P0174. It indicates that your Cadillac DeVille is running lean on the bank two side of the engine. P0174 and P0171 (fuel trim lean bank one) are the most frequently seen air/fuel mixture-related codes. If they appear together, it reduces the list of … Read more
If your Cadillac DTS has the P0304 trouble code, you should know that it’s about as common of a code as there is. It’s a generic OBD IIcode (same meaning for all vehicles) that indicates that your car’s fourth cylinder is misfiring. P0304 is a drivability concern and should be dealt with right away. If … Read more
If your Cadillac DeVille has the P0304 trouble code, you should know that it’s about as common of a code as there is. It’s a generic OBD IIcode (same meaning for all vehicles) that indicates that your car’s fourth cylinder is misfiring. P0304 is a drivability concern and should be dealt with right away. If … Read more
P0401 is a very common OBDII trouble code that’ll pop up in the Cadillac DeVille. It has to do with the emissions system and stands for Exhaust Gas Recirculation (EGR)→ Insufficient Flow. The EGR system in your car is responsible for recirculating exhaust gasses in order to lower the vehicle’s emissions output. There are three … Read more
P0135 is a very common OBDII code that occurs in the Cadillac DeVille. It is caused by a failure in one of the oxygen sensors heated elements, specifically bank 1 sensor 1. It technically stands for: P0135: Heated Oxygen Sensor → Sensor Heater Circuit Malfunction → Bank 1, Sensor 1 The purpose of the heated … Read more
If your Cadillac DeVille has the P0303 trouble code, you should know that it’s about as common of a code as there is. It’s a generic code (same meaning for all vehicles) that indicates that your car’s third cylinder is misfiring. P0303 is a real drivability concern and should be dealt with right away. If … Read more
P0741 is a very common trouble code. It’s know to affect the Cadillac DeVille quite often. Here’s what it means: P0741: Torque Converter Clutch Circuit → Performance or Stuck Off The DeVille uses a clutch in the torque converter to lock the engine and transmission together at highway speed. P0741 can register whenever this connection … Read more
P0302 in the Cadillac DeVille is a common OBD II trouble code. It indicates that your car’s second cylinder has a misfire. P0302 is a real drivability concern and should be dealt with right away. If it’s bad enough to cause your DeVille’s check engine light to come on, you shouldn’t drive your car at … Read more
P0301 is a fairly common trouble code with the Cadillac DeVille. It’s an OBD2 code and indicates that your car’s first cylinder is misfiring. P0301 is certainly a cause for concern and should be considered a threat to the drivability of your DeVille. Fixing P0301 should be considered a high priority. Unlike a lot of … Read more