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Alfa Romeo 156 Fault Codes


You can find common Alfa Romeo 156 fault codes on this page that when clicked take you to a detailed description.

You can also type in the fault code you are getting below to find a more detailed description.

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Alfa Romeo 156 Recalls

When a car manufacturer detects a problem with a model they put out a recall notice and more often than not offer to fix the problem free of charge.

You can check to see if your Alfa Romeo 156 has any recall notices on our sister site AutoRecalls.co, sorted by model year.

View Alfa Romeo 156 Recalls »
Recall Notice Icon

Error Icon P0236

Turbocharger Boost Sensor A Circuit Range/Performance.

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Error Icon P0704

Clutch Switch Input Circuit Malfunction

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Severity Icon 8/10

Error Icon P0335

Crankshaft Position Sensor A Circuit Malfunction

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Error Icon P0180

Fuel Temperature Sensor A Circuit Malfunction

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Severity Icon 8/10

Error Icon P0303

Cylinder 3 Misfire Detected

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Error Icon P0500

Vehicle Speed Sensor Malfunction

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Error Icon P0655

Engine Hot Lamp Output Control Circuit Malfunction

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Severity Icon 7/10

Error Icon P0380

Glow Plug/Heater Circuit A Malfunction More details...

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Error Icon P0220

Throttle/Pedal Position Sensor/Switch B Circuit Malfunction

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Error Icon P0443

Evaporative Emission Control System Purge Control Valve circuit Malfunction

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Error Icon P1560

Maximum Engine Speed Exceeded

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Error Icon P0365

Camshaft Position Sensor B Circuit (Bank 2)

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Error Icon P0363

Misfire Detected - Fueling Disabled

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Error Icon P06DD

Engine Oil Pressure Control Circuit Stuck Off

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Severity Icon 8/10

Error Icon P1235

Fuel Pump Control Out Of Range

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Error Icon P1238

Fuel Pump Secondary Circuit Malfunction

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Error Icon P1320

Knock Sensor 2 Circ. Short to Ground

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Error Icon P1688

Metering Oil Pump Stepping Motor Circuit Malfunction

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Error Icon P1177

Synchronization Fault

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Error Icon P1173

Rotor Calibration Fault

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Error Icon P1176

Cam Calibration Fault

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Error Icon P1151

Lack Of HO2S21 Switch - Sensor Indicates Lean

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Error Icon P1172

Rotor Control Fault

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Error Icon P1561

Quantity Adjuster Deviation

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Error Icon P1562

Quantity Adjuster Upper Limit Attained

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Error Icon P1850

Transmission Transfer Case Contact Plate 'B' Circuit Failure

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Error Icon P0091

Fuel Pressure Regulator Control Circuit Low

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Severity Icon 8/10

Error Icon P0016

Crankshaft Position Camshaft Position Correlation Bank 1 Sensor A

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Severity Icon 9/10

Error Icon P0300

Random/Multiple Cylinder Misfire Detected

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Error Icon P2002

Diesel Particulate Filter Efficiency Below Threshold Bank 1

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Severity Icon 8/10

Error Icon P0340

Camshaft Position Sensor Circuit Malfunction

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Error Icon P0238

Turbocharger Boost Sensor A Circuit High

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Severity Icon 4/10

Error Icon P0101

Mass or Volume Air flow Circuit Range/Performance Problem

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Severity Icon 6/10

Error Icon P1206

Injector Circuit Open / Shorted - Cylinder #6

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Severity Icon 7/10

Error Icon P0010

Intake Camshaft Position Actuator Circuit / Open (Bank 1)

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Severity Icon 9/10

Error Icon P0011

Intake Camshaft Position Timing - Over-Advanced (Bank 1)

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Severity Icon 9/10

Error Icon P0012

Intake Camshaft Position Timing - Over-Retarded (Bank 1)

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Severity Icon 7/10

Error Icon P0013

Exhaust Camshaft Position Actuator Circuit / Open (Bank 1)

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Severity Icon 8/10

Error Icon P0014

Exhaust Camshaft Position Timing - Over-Advanced (Bank 1)

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Severity Icon 8/10

Error Icon P0017

Crankshaft Position Camshaft Position Correlation Bank 1 Sensor B

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Severity Icon 4/10

Error Icon P0036

Heated Oxygen Sensor (HO2S) Heater Control Circuit Bank 1 Sensor 2

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Severity Icon 4/10

Error Icon P0102

Mass or Volume Air Flow Circuit Low Voltage Input

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Severity Icon 8/10

Error Icon P0106

Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance Problem

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Severity Icon 8/10

Error Icon P0113

Intake Air Temperature Circuit High Input

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Severity Icon 4/10

Error Icon P0128

Coolant Thermostat (Coolant Temp Below Thermostat Regulating Temperature)

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Severity Icon 6/10

Error Icon P0131

O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)

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Severity Icon 7/10

Error Icon P0134

O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)

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Severity Icon 6/10

Error Icon P0135

O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)

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Severity Icon 4/10

Error Icon P0137

O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)

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Severity Icon 6/10

Error Icon P0138

O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)

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Severity Icon 6/10

Error Icon P0141

O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

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Severity Icon 7/10

Error Icon P0171

System Too Lean (Bank 1)

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Severity Icon 5/10

Error Icon P0172

System Too Rich (Bank 1)

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Severity Icon 5/10

Error Icon P0175

System Too Rich (Bank 2)

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Severity Icon 8/10

Error Icon P0301

Cylinder 1 Misfire Detected

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Severity Icon 8/10

Error Icon P0302

Cylinder 2 Misfire Detected

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Severity Icon 8/10

Error Icon P0304

Cylinder 4 Misfire Detected

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Severity Icon 8/10

Error Icon P0305

Cylinder 5 Misfire Detected

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Severity Icon 8/10

Error Icon P0306

Cylinder 6 Misfire Detected

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Severity Icon 3/10

Error Icon P0325

Knock Sensor 1 Circuit (Bank 2 or Single Sensor)

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Severity Icon 8/10

Error Icon P0332

Knock Sensor 2 Circuit Low Input (Bank 2)

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Severity Icon 6/10

Error Icon P0341

Camshaft Position Sensor Circuit Range/Performance

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Severity Icon 7/10

Error Icon P0401

Exhaust Gas Recirculation Flow Insufficient Detected

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Severity Icon 7/10

Error Icon P0420

Catalyst System Efficiency Below Threshold (Bank 1)

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Severity Icon 7/10

Error Icon P0430

Catalyst System Efficiency Below Threshold (Bank 2)

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Severity Icon 3/10

Error Icon P0441

Evaporative Emission Control System Incorrect Purge flow

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Severity Icon 3/10

Error Icon P0442

Evaporative Emission Control System Leak Detected

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Severity Icon 3/10

Error Icon P0446

Evaporative Emission Control System Vent Control Circuit Malfunction

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Severity Icon 4/10

Error Icon P0449

Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction

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Severity Icon 4/10

Error Icon P0455

System Gross Leak Evaporative Emission

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Severity Icon 3/10

Error Icon P0456

Evaporative Emissions System Small Leak Detected

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Severity Icon 5/10

Error Icon P0463

Fuel Level Sensor Circuit High Input

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Severity Icon 3/10

Error Icon P0496

Evaporative Emission System High Purge Flow

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Severity Icon 3/10

Error Icon P0507

Idle Control System RPM higher Than Expected

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Severity Icon 9/10

Error Icon P0700

Transmission Control System Malfunction

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Severity Icon 7/10

Error Icon P2096

Post Catalyst Fuel Trim System Too Lean Bank 1

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Alfa Romeo 156 Image

About the 156

Alfa Romeo’s compact executive 156 first made its debut in 1996. It was then on the market for just over a decade, until the discontinuation of its nameplate in 2007.

There was only a single generation to hit the market during its time, but Alfa Romeo released a number of different layouts for the model. These consisted of a 4-door saloon, a 5-door station wagon, and a 5-door crossover SUV. The latter were sold as the Sportwagon and Crosswagon respectively.

The model was replaced by the 159 in 2005, despite being on sale for two years after this.

It was offered with a selection of various petrol and turbocharged diesel powertrains.

Unfortunately for diesel owners, the most common fault code for the 156 is P0256, which represents an issue with the turbocharger sensor circuit. This was because all of the petrol options were naturally aspirated.

Any issues with the turbocharger can be both serious and costly. If the sensor is unable to perform properly, the powertrain control module (PCM) will not be able to properly regulate the amount of boost from the turbocharger.

This can put the 156 into limp mode, making it very important to have the issue resolved immediately.

Another code that reportedly affected the model relatively commonly is code P0704. This code represents a malfunction with the clutch switch. Thankfully, this means that any models fitted with an automatic transmission did not suffer this code.

This is also a fairly serious code as it can prevent the car from shifting properly and even starting at all, as well as putting it in limp mode like with the previous code.

One of the main causes for this issue is that the clutch pedal itself does not return all the way to its off position. This can be due to a defective linkage, which can be replaced. A faulty clutch switch sensor is also fairly common for the 156.