Opel Signum P0325: Knock Sensor “1” – Circuit Malfunction

P0325 is a powertrain OBDII trouble code that has the same meaning for the Opel Signum as it would any other vehicle. By definition, it means that the vehicles ECM/PCM isn’t getting the proper signal to or from the knock sensor. Clearing this code typically requires a new knock sensor or correcting a short or … Read more

Opel Signum P0304: Cylinder 4 | Misfire Detected

P0304 is a relatively common trouble code with any vehicle, that includes the Opel Signum. It’s and OBD2 code and stands for: P0304: Misfire Detected → Cylinder 4 P0304 is certainly a cause for concern, and should be considered a threat to the drivability your Signum. The nice thing about P0304 is that it’s a … Read more

Opel Signum P0340: CPS – Circuit Malfunction

P0340 is a somewhat common and difficult trouble code to diagnose. The Opel Signum is no exception to this rule. That’s because it’s a generic powertrain code. Generic codes tell you that there is a problem, but they don’t really tell you what particular part of the system is throwing the code.     OBDII … Read more

Opel Signum P0303: Cylinder 3 – Misfire Detected

P0303 is a relatively common Opel Signum trouble code. It stands for: P0303: Misfire Detected → Cylinder 3 P0303 should not be ignored, and can be a threat to the drivability the Opel Signum. The nice thing about P0303 is that it’s a cylinder specific trouble code, which makes diagnosing the problems simpler than P0300, … Read more

Opel Signum P0446: EVAP Vent Control Circuit → Malfunction

One of the most common trouble codes with the Opel Signum is the P0446 code. This trouble code references a number that is given to you when you plug your Signum into a OBDII scanner. P0446 Indicates that there is a fault in the evaporative emission control system. It often appears with other codes, such … Read more

Opel Signum P0442 OBDII Code Diagnosis

One of the most common trouble codes with the Opel Signum is the P0442 code. This code number references a number that is given to you when you plug your vehicle into a OBDII scanner. It’s typically not going to be a problem that’ll lead to an immediate breakdown, but it should not be ignored. … Read more

Opel Signum P0441: EVAP System – Incorrect Purge Flow

P0441 is one of the more common OBD-II trouble codes with the Opel Signum. It’s a generic powertrain code, which means regardless of what auto manufacturer built the vehicle, it’ll have the same meaning. P0441 indicates that there is an issue with the Evaporative Emissions System. It’ll often appear with P0455.     The Signum’s … Read more

Opel Signum P0430 OBD2 Code Diagnosis

This page will help you troubleshoot the Opel Signum P0430 trouble code. In the Signum, this code is often caused by a bad oxygen sensor, but there can be other causes as well. We’ll take a look at them below. P0430 technically stands for:   One of the most common trouble codes with all Opel … Read more

Opel Signum P0401: EGR – Insufficient Flow Diagnosis

P0401 is a common OBDII trouble code that’ll pop up in the Opel Signum. It has to do with the emissions system and stands for: The EGR system on a vehicle is responsible for recirculating exhaust gasses in order to lower the vehicles emissions output. There are three main parts of the Signum’s EGR system. … Read more