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Autopart Mechanic

Autopa ... 4/9/2018

2012 BMW X1 xDrive28i 6 Cyl 3.00L


How do I fix the P2098 OBD-II Trouble Code? How can I diagnose Post Catalyst Fuel Trim System Too Lean Bank 2 of my car?

1 Answer

PartsAvatar Ca

PartsAvatar Ca 4/9/2018

What the P2098 code means?

P2098 is an OBD-II generic code for the engine control module (ECM) detecting the post catalyst O2 sensor
fuel trim is testing too lean on a two trip minimum to set the code.

What causes the P2098 code?

Exhaust leak

Oxygen sensor failure

Wiring issue

What are the symptoms of the P2098 code?

Symptoms for this code can vary greatly, due to its generality. Negative fuel trim indicates that the PCM is
attempting to lean the air/fuel mixture and a positive fuel trim indicates that the PCM is attempting to richer
it. Symptoms can include just a service engine soon lamp, poor acceleration, a hesitation or misfire upon
acceleration or at start up, engine stall at start up, black smoke upon acceleration (or at start up), sub-par
fuel economy, or there may be no symptoms at all.

Common mistakes when diagnosing the P2098 code?

Technicians report that this code rarely occurs without the accompaniment of other fuel system codes.
This code is rarely exhibited in vehicles that are not manufactured in Europe. Failure to diagnose other
codes, before diagnosing this code, can lead to a misdiagnosis.

What repairs can fix the P2098 code?

Clearing the code and repairing the exhaust leak

Replacing the pre catalyst O2 sensor or repair the wiring

Replace O2 sensors for the pre and post catalyst if they are damaged from an issue that has got repaired
like a head gasket that leaked coolant into the exhaust


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