Peugeot 205 P0957 Engine Trouble Code
What is Peugeot 205 P0957?
When Peugeot 205 P0957 code appears, first check your gas cap. Pull over safely, ensure it is tight, and inspect for cracks. A loose or damaged gas cap affects fuel-system pressure and emissions. A replacement cap costs about $3–$10. This simple fix can resolve the code and improve fuel economy.
P0957 on the Peugeot 205
The Peugeot 205 ECU flash version prior to the 2.4.1 update has a known calibration bug that can generate spurious P0957 codes under hard deceleration. Verifying the ECU software version is always the first step before any mechanical diagnosis on this model.
Code Information
| Code Type: | OBD-II Powertrain (P) Trouble Code |
| System: | Powertrain |
| Vehicle: | Peugeot 205 |
| Brand: | Peugeot |
| Model: | 205 |
| Code: | P0957 |
P0957 Peugeot 205 Symptoms
Check Engine Light
Illuminated Peugeot 205 dashboard warning
Engine Stalling
Engine stops unexpectedly or misfires
Performance Issues
Reduced power or acceleration on the Peugeot 205
Starting Problems
Difficulty starting the engine
Poor Fuel Economy
Increased fuel consumption on the Peugeot 205
Increased Emissions
Failed emissions test due to P0957
P0957 Code Structure
Understanding what each digit means in the P0957 powertrain trouble code:
| P | 0 | 9 | 5 | 7 |
|---|---|---|---|---|
| Powertrain Code | Intake Valve Control Solenoid Circuit Low | Injector Circuit Malfunction - Cylinders | Cylinder 1 Injector Circuit Low | Shift/Timing Solenoid Malfunction |
How to Fix Peugeot 205 P0957
Diagnostic Steps:
Oxygen sensors measure exhaust gas oxygen content to optimise air-fuel ratio. This optimisation improves fuel economy and reduces emissions. Sensors degrade over time and require periodic replacement.
Repair Solution:
Excessive air inflow may result from vacuum leaks, dirty sensors, or EGR valves not closing properly. Insufficient fuel can stem from dirty injectors, clogged filters, weak fuel pump, or leaking pressure regulator.
Technical Notes:
P0957 DTCs can be triggered by upstream issues. For example, a dirty MAF sensor may cause incorrect fuel-trim adjustments, leading oxygen sensors to report mixture problems. Address root causes first.
Peugeot 205 P0957 Repair Cost
Addressing P0957 on your Peugeot 205 typically involves: dealer diagnostic fee $95–$150, oxygen sensor replacement $180–$320 (parts + labour), or catalytic converter replacement $1,800–$2,400 if damage has progressed. Independent specialist garages often charge 20–30% less than franchised dealers for identical work.
P0957 Description
P0957 engine trouble code is related to Shift/Timing Solenoid Malfunction.
Main Cause
The primary reason for P0957 OBD-II Engine Trouble Code is: Injector Circuit Malfunction - Cylinders.
Common P0957 Misdiagnosis on the Peugeot 205
Workshop technicians sometimes replace the entire ignition coil assembly on the Peugeot 205 when P0957 accompanies a cylinder-specific misfire. In many cases, only the spark plug in the misfiring cylinder has fouled; a $8 plug replaces a $140 coil pack.
DIY Repair Guide: P0957 on Peugeot 205
The coolant temperature sensor on the Peugeot 205 is a straightforward DIY item (difficulty 2/5). Have a drain tray ready for the small amount of coolant that spills when the sensor is removed. Top up the cooling system afterwards and check for air pockets.
Preventing P0957 on the Peugeot 205
Using only genuine or OEM-specification fuel injectors in the Peugeot 205 ensures precise spray pattern and flow rate. Inferior aftermarket injectors are a documented trigger for P0957 through off-target fuel delivery.
Frequently Asked Questions — Peugeot 205 P0957
A: Almost certainly yes. Most faults that trigger P0957 cause the ECU to operate in open-loop mode or apply overly rich fuel trims, both of which increase fuel consumption by 5–15%. Resolving the fault promptly pays for itself in fuel savings over time.