P2098 OBD-II Trouble Code: Post Catalyst Fuel Trim System Too Lean Bank 2

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Cost of diagnosing the P2098 code

P2098 is a diagnostic trouble code (DTC) for "Post Catalyst Fuel Trim System Too Lean Bank 2". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
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Toyota$70.00$30.00
BMW$70.00$30.00
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Check Engine Light

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?

  • The ECM is detecting the pre catalyst O2 sensor not working correctly and then monitors the post catalyst O2 sensor to see if the problem correlates to the pre catalyst O2 sensor on a two trip requirement.

  • The exhaust may have a leak or engine problem before the pre catalyst sensor.

  • The engine may have mechanical or fuel related issues causing the code.

  • The O2 sensor wiring or sensor is the failure.

What are the symptoms of the P2098 code?

  • The Check Engine light will be illuminated and the code is set in ECM memory as a fault after the two trips are completed back to back.

  • The ECM will go into failure mode for fuel control. This may cause lean or rich drive symptoms depending on the manufacture failure mode strategy.

  • If the problem goes away then the engine will go back to operating normal again, but will keep the Check Engine light on till it is cleared.

How does a mechanic diagnose the P2098 code?

  • Scans for codes and documents the code in the ECM and looks at the freeze frame data for failure.

  • Scans the ECM to see if the O2 sensors are indicating a problem on one or both sides of the engine. Notes to clear the code to get the engine out of failure mode fuel strategy.

  • Checks the engine for exhaust leaks, O2 sensor or wiring damage.

  • Checks the engine for any other codes that may cause the O2 sensors to fail.

Common mistakes when diagnosing the P2098 code?

  • Clearing ECM memory codes before checking the freeze frame data for the main failure problem, so the failure may be duplicated and repaired

  • Failing to clear the ECM codes to properly test the O2 sensors out of failure mode

  • Failing to verify and correct any exhaust leaks or other problems that may cause the code P2098

  • Failing to verify the O2 sensor operation is normal after the repairs are done

How serious is the P2098 code?

Code P2098 is a code indicating the ECM cannot control the fuel as it needs to since the O2 sensor is not giving the fuel control closed loop control it needs to control the fuel correctly.

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

Additional comments for consideration regarding the P2098 code

Code P2098 will come on only after the ECM has detected the problem to happen for two complete drive cycles. The most common problem is an exhaust leak at the exhaust manifold gasket or flange. The repair of the exhaust may fix the code from coming back.

Need help with a P2098 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

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Jerimiah

16 years of experience
207 reviews
Jerimiah
16 years of experience
I was impressed with how prompt he was, showing up a little early. The way he explained things helped me understand the symptoms and the problems so that I was confident in his recommendation and the work he would soon perform. Jerimiah is the "man" and he isn’t trying to over sell you or talk down to you, good honest knowledge/quotes so You can keep your vehicle running.
2006 CHEVROLET MALIBU - CHECK ENGINE LIGHT IS ON - NORTH LAS VEGAS, NEVADA

Dan

36 years of experience
611 reviews
Dan
36 years of experience
Dan was not very convincing of his willingness to solve my engine light problem. Based on the fact I had just had the car repaired (water Pump) under warranty at the stealership. I told him what they told me about a misfiring cyl #4 to be exact but after only a few minuets his response was looks like they changed your spark plugs and I don't have the proper equipment like Cadillac does to say what it really is.
2011 CADILLAC STS - CHECK ENGINE LIGHT IS ON - LAWRENCEVILLE, GEORGIA

Jeffrey

24 years of experience
683 reviews
Jeffrey
24 years of experience
Jeffrey was early to the appointment and did a thorough inspection to cure my check engine light. He explained the mechanical problem in detail and even researched to see if there were any recalls or updates available from the manufacturer. I will definitely book with him again if I need any work or service done on my car.
2016 HYUNDAI SONATA - CHECK ENGINE LIGHT IS ON - CHARLOTTE, NORTH CAROLINA

Chris

8 years of experience
223 reviews
Chris
8 years of experience
Arrived right on time quick & efficient
2000 PONTIAC GRAND AM - CHECK ENGINE LIGHT IS ON - CHANDLER, ARIZONA

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