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17536

P1128-001

16804

P0420-001

17536/P1128/004392 - Fuel Trim; Bank 1 (Mult): System too Lean

Possible Symptoms

Malfunction Indicator Light (MIL) active

Possible Causes

Mass Air Flow (MAF) Sensor faulty

Oxygen Sensor Control faulty

Oxygen Sensor(s) faulty

Fuel Injector(s) faulty

Possible Solutions

Check Mass Air Flow (MAF) Sensor

Check Oxygen Sensor Control

Check Oxygen Sensor(s)

Check Fuel Injector(s)

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

Special Notes

For 1.8T's experiencing this fault code, this thread may be useful: http://forums.vwvortex.com/zerothread?id=663057