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Hi,

I have a Peugeot 307 SW 2.0 car, 2004 model.
All of sudden, the engine light came up and the display shows "anti pollution fault".
ODB device showed the following codes:
p0170 Fuel trim malfunction (Bank 1)
P0131 O2 senso Circuit Low Voltage (Bank 1 Sensor 1)
P0132 (O2 Sensor Circuit High Voltage (Bank 1 Sensor 1)

I turned off the warning light and took it for annual inspection but I failed inspection and note from them are:
increased idle CO concentration too high (8.2.1.1)
increased idle HC content is too high
increased idle lambda value incorrectly

Any idea what has gone wrong and what should be fixed ?
 

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car is overfueling but there are many possible reasons for this reading codes wont really give you the answers a service might help depends how high the readings were.

1 OR BOTH of your lambda probes could have a bad connection or be faulty but could be a combination of things these engines do suffer from overfueling and rough running issues.
 
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