Lambda Sensor

Questions specifically about a Petrol powered Citroen C3 (usually engine or fuel related problems).
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Petrol engine related faults, like injectors, error codes, overheating.
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My Name: Citowner

Contributor
Posts: 7
Joined: Mon May 15, 2017 1:06 pm
Model: C3 2002-2005, Original shape model
Year: 2003 (03)
Engine Size: 1.4
Fuel Type: Petrol
Mileage: 119000
Trim Level: Desire
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)

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Hi people, please can someone advise as to the location on the before and after cat Lambda Sensors as I have fault code PO 420 and would like to change the after cat sensor first, thanks guys
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My Name: Arfur Dent

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Joined: Sat Jul 23, 2011 3:47 pm
Model: C3 2002-2005, Original shape model
Year: 2002 (52)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 100000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: DV4 16-valve diesel (90 PS)
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Citowner wrote:Hi people, please can someone advise as to the location on the before and after cat Lambda Sensors as I have fault code P 0420 and would like to change the after cat sensor first, thanks guys
The first is easy to spot, its on the top of the exhaust manifold. The second is on the exhaust down pipe.

Both can be very difficult to remove because the high exhaust temperatures cause the threads to stick nice and tight.

Have you tried to clear the code and see if it ever comes back?
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My Name: Citowner

Contributor
Posts: 7
Joined: Mon May 15, 2017 1:06 pm
Model: C3 2002-2005, Original shape model
Year: 2003 (03)
Engine Size: 1.4
Fuel Type: Petrol
Mileage: 119000
Trim Level: Desire
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)

Post

Hi thanks for replying, I have cleared the code this morning, but I just thought that if i haven't changed it then it will just come back on, is that not always the case ?
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