VW Polo Fault codes

[simfin]

Had my Sons Polo looked at by a very kind garage that used a VCDS to check the codes. Below is the result - 3 intermittants and a normal one. The codes have been cleared which has cleared the Orange engine warning light and has stayed off for 10 miles driving back.

I know it is not an Audi, but does anyone have any clues what may have been the problem - specifically the non-intermittant code 16804. It is a 1.2 E '52 plate

[bez101]

im gona go for 02 sensor or cat
16804/P0420/001056 - Catalyst System; Bank 1: Efficiency Below Threshold

Possible Causes

• Leakage in Intake and/or Exhaust System
• Catalyst faulty
• Oxygen Sensor(s) faulty
• Oxygen Sensor(s) Control faulty

Possible Solutions

• Check Intake and Exhaust System for Leaks
• Check Catalyst
• Check Oxygen Sensor(s)
• Check Oxygen Sensor(s) Control
  
  • Perform Oxygen Sensor(s) Aging Check

[bez101]

your 16556 will go with the 16804 code

[simfin]

im gona go for 02 sensor or cat
16804/P0420/001056 - Catalyst System; Bank 1: Efficiency Below Threshold

Possible Causes

• Leakage in Intake and/or Exhaust System
• Catalyst faulty
• Oxygen Sensor(s) faulty
• Oxygen Sensor(s) Control faulty

Possible Solutions

• Check Intake and Exhaust System for Leaks
• Check Catalyst
• Check Oxygen Sensor(s)
• Check Oxygen Sensor(s) Control
  
  • Perform Oxygen Sensor(s) Aging Check

Excellent, thanks for the info - Hope it isnt the Cat


Where do I find the cross referance for the fault codes? Is it freely available ?

[simfin]

Ahhh, dont worry , found it on ross tech. thanks again

[NHN]

Yeah I'd also go with O2 sensor 1st.