Catalytic Converters (Catalyst / Cat). What are they and how do they work? A Catalytic Converter (Cat) is an emissions control device that reduces the level of harmful exhaust gasses that enter the atmosphere. It works by converting exhaust emissions into less harmful ones when the gasses pass through it, triggering a chemical reaction. A vehicle will fail an emissions test on either, or all, of the following factors.
CO Failure can mean several things, but is most likely caused by a poorly running vehicle. If a Cat becomes contaminated with unburned fuel, it will become unable to effectively convert the gasses that pass through it. A new Cat at full capacity will almost certainly lead to a MOT pass, but unless the fault is rectified, the customer will return the next year complaining of the same problem. HC Failure is an indicator that the vehicle is over-fuelling. A vehicle will fail on this reading if it has HCs in excess of 200ppm.HCs in excess of 60ppm indicates a vehicle problem that needs rectifying as soon as possible. Lambda Failure means there is a problem with the air:fuel ratio on the vehicle.
If the lambda reading is less than 0.97, the vehicle is running too rich. If the lambda reading is greater than 1.03, the vehicle is running too lean. Compatible with the following OEM references. CITROëN C4 Coupe (LA_) 1.6 THP 150. Construction Year to: 04/2010; Fitting Position: Front; Emission Standard: Up to Euro 4.
CITROëN C4 GRAND PICASSO I (UA_) 1.6 16V. Construction Year from: 10/2008; Fitting Position: Front; Emission Standard: Up to Euro 4.
Construction Year to: 04/2011; Fitting Position: Front; Emission Standard: Up to Euro 4. CITROëN C4 I (LC_) 1.6 THP 140. CITROëN C4 I (LC_) 1.6 THP 150. CITROëN C4 PICASSO I MPV (UD_) 1.6 16V.
CITROëN C4 PICASSO I MPV (UD_) 1.6 THP 140. MINI MINI (R56) Cooper S. Fitting Position: Front; Emission Standard: Up to Euro 4. MINI MINI (R56) Cooper S John Cooper Works. MINI MINI (R56) John Cooper Works.
Construction Year to: 02/2010; Fitting Position: Front; Emission Standard: Up to Euro 4. MINI MINI CLUBMAN (R55) Cooper S.
MINI MINI CLUBMAN (R55) Cooper S John Cooper Works. MINI MINI CLUBMAN (R55) John Cooper Works.
MINI MINI Convertible (R57) Cooper S. MINI MINI Convertible (R57) John Cooper Works. PEUGEOT 207 (WA_, WC_) 1.6 16V RC. Construction Year from: 04/2007; Construction Year to: 04/2011; Fitting Position: Front; Emission Standard: Up to Euro 4.
PEUGEOT 207 (WA_, WC_) 1.6 16V Turbo. Construction Year from: 12/2006; Construction Year to: 04/2011; Fitting Position: Front; Emission Standard: Up to Euro 4. PEUGEOT 207 CC (WD_) 1.6 16V Turbo.
Engine Code: 5FR (EP6DT); Construction Year to: 04/2011; Fitting Position: Front; Emission Standard: Up to Euro 4. PEUGEOT 207 SW (WK_) 1.6 16V RC. PEUGEOT 207 SW (WK_) 1.6 16V Turbo. PEUGEOT 3008 I MPV (0U_) 1.6 THP.
PEUGEOT 308 CC (4B_) 1.6 16V. PEUGEOT 308 I (4A_, 4C_) 1.6 16V. PEUGEOT 308 SW I (4E_, 4H_) 1.6 16V. This can include addresses in Scotland, Northern Ireland, Isle of Man, Shetland Islands and Channel Islands.