Audi P1128: Long Term Fuel Trim Add. Air. Bank 1 System Too Lean

Is your scanner showing Audi P1128?
No worries. We'll show you what it means and how to deal with it.

Presented by

Randy Worner

00:00/00:00

Audi P1128: Long Term Fuel Trim Add. Air. Bank 1 System Too Lean

OVERVIEW

Severity

High

DIY Difficulty Level

Intermediate

Repair Cost

$50-$500

Can I Still Drive?

What Does The Audi P1128 Code Mean?

Engine started, battery voltage must be at least 11.5v, all electrical components must be off, the ground between the engine and the chassis must be well connected, the exhaust system must be properly sealed between the catalytic converter and the cylinder head, and the oxygen sensor heater for oxygen sensor before the catalytic converter must be properly functioning.

The fuel mixture is so rich that the O2S control is on lean limit. Note: When an O2S malfunction (P0131 to P0414) is also stored with this malfunction, the O2S malfunction(s) should be repaired first.

Note: After exhaust system repairs, make sure exhaust system is not under stress and that it has sufficient clearance from the bodywork. If necessary, loosen double clamps and align exhaust pipe so that sufficient clearance is maintained to the bodywork and support rings carry uniform loads. Do not use any silicone sealant. Traces of silicone components which are sucked into the engine are not burned there, and they damage the oxygen sensor.