The catalytic converter helps control your car’s emission levels by breaking down noxious gases into less harmful pollutants before they leave your exhaust. When the bank 2 oxygen sensor 2 unit reports a lean condition in the exhaust stream leaving the converter, the engine’s computer stores a code P2098.
What Does the P2098 Code Mean?
Diagnostic trouble code (DTC) stands for “P2098 Post Catalyst Fuel Trim System Too Lean (Bank 2). ” It means the exhaust stream on the bank 2 side contains higher oxygen levels exiting the converter than it should.
As their name implies, the oxygen sensors measure the amount of oxygen in the exhaust gases coming from the running engine. One sensor (referred to as the upstream sensor) is located before the catalytic converter. The other sensor (referred to as the downstream sensor) is located behind the catalytic converter.
Your car’s primary computer, which is often referred to as the powertrain control module (PCM), uses the data from the upstream sensor when calculating how much fuel the engine needs. Meanwhile, the PCM primarily uses the data from the downstream sensor to determine catalytic converter efficiency.
Code P2098 involves the post catalyst oxygen sensor on bank 2, the opposite side as the engine’s cylinder 1.
Note: While the Society of Automotive Engineers (SAE) laid out the generic code P2098 for most vehicles, the vehicle’s manufacturer may set a different definition for this code. Check the appropriate repair manual.
Vehicles that are prone to code p2098 include various models of BMW (especially BMW X5), Chrysler, Jeep, Kia, and Cadillac.
What are the Possible Causes of the P2098 Code?
Several issues can trigger the lean readings in the bank 2 oxygen sensor 2 unit. The PCM may log a P2098 code in response to:
- A leak in the exhaust system
- Bad or failing oxygen sensor
- A problem in the post-catalytic oxygen sensor circuit (e.g., damaged wires or poor connections),
- Lean running condition
- An issue with the PCM, such as software in need of an update
What are the Common Symptoms of the Code P2098?
The following symptoms may also appear along with code P2098:
- Check Engine Light illuminates or blinks
- Rough idle
- Poor acceleration
- Engine misfire
- Overheating catalytic converter
How to Diagnose the P2098 Code
A P2098 code won’t cripple your vehicle’s drivability, so you can still bring it to an auto repair shop and get it repaired. For car owners with plenty of skill in DIY car repair, an advanced diagnostic scan tool can make it easier to identify the root of this trouble code.
The diagnostic steps associated with code P2098 depend on the year, make, and model of the vehicle. Consult the appropriate repair manual for the recommended troubleshooting procedure.
How to Fix the P2098 Code
Fixing the P2098 code may not be a straightforward affair when you consider the number of possible reasons that could have triggered it. A lot of people often let their mechanics do the fixing to spare themselves the trouble of trying to figure out the proper fix.
If you do have the necessary automotive DIY skills, you can try to do the job yourself with the help of online repair guides or manuals. Just keep in mind that vehicles from different manufacturers may have their own repair procedures and that a fix that works on a particular model may not work on another one.
Other Notes About P2098
The P2096 code resembles P2098 in almost all regards. This similar code applies to the post catalytic oxygen sensor on bank 1, the same side as the engine’s cylinder 1.
Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic.