Question about 2003 Hyundai Santa Fe

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We have the same prob

We took it to autozone and they put it on the computer the code read:BBH02S21 lambda at limit-rich condition, probable cause 881- fuel pressure too high,
882- fuel pressure regulator fault, 883- plugged air filter or exhaust, 884- failed injectors do you think any of these are the culprit?

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  • Hyundai Master
  • 1,348 Answers

Plugged air filter will result in too lean.not too rich. have the fuel pressure tested. overfuelling will result in the catalytic converter overheating.if the 02 sensor on the catalytic is no good,it will not sense unburnt fuel and the ecu will overfuel. check the air inlet hose and the airflow meter

Posted on Jul 13, 2009

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Engine light went on. Took car to mechanic who removed the light. Wrote on card ECM 250A, light came on next day. What does this code mean?


This error code is a result of the engine fuel management system air fuel ratio has adjusted the fuel air trim to the high limit. This is most likely an O2 sensor or less likely a lambda sensor or possible a fuel supply problem.

Each of these components an be checked by a qualified service center. The system has expensive components so I suggest assuring the diagnostics before starting to swap in parts. After market parts are available, however my experience has concluded factory parts from the dealer is the most reliable repair.

Caution is suggested. Even though the car may have no drive ablity problems, a condition can occur that will damage the caltalitic convertor if the fuel air mix is to rich causing the cat to overheat!!

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DTC P2097 Post Catalyst Fuel Trim System High Limit Bank 1
Circuit Description
The wide band heated oxygen sensor (HO2S) measures the amount of oxygen in the exhaust system and provides more information than the switching style HO2S. The wide band sensor consists of an oxygen sensing cell, an oxygen pumping cell, and a heater. The exhaust gas sample passes through a diffusion gap between the sensing cell and the pumping cell. The engine control module (ECM) supplies a voltage to the HO2S and uses this voltage as a reference to the amount of oxygen in the exhaust system. An electronic circuit within the ECM controls the pump current through the oxygen pumping cell in order to maintain a constant voltage in the oxygen sensing cell. The ECM monitors the voltage variation in the sensing cell and attempts to keep the voltage constant by increasing or decreasing the amount of current flow, or oxygen ion flow, to the pumping cell. By measuring the amount of current required to maintain the voltage in the sensing cell, the ECM can determine the concentration of oxygen in the exhaust. The HO2S voltage is displayed as a lambda value. A lambda value of 1 is equal to a stoichiometric air fuel ratio of 14.7:1. Under normal operating conditions, the lambda value will remain around 1. When the fuel system is lean, the oxygen level will be high and the lambda signal will be high or more than 1. When the fuel system is rich, the oxygen level will be low, and the lambda signal will be low or less than 1. The ECM uses this information to maintain the correct air/fuel ratio.
Fuel trim biasing is used by the ECM to keep the post catalyst HO2S voltage within a range of 580-665 mV as possible. This allows optimal catalyst efficiency under light load conditions, such as at idle or a steady cruise. The ECM constantly monitors how lean or rich the fuel trim bias is commanded. If the ECM detects that the fuel trim bias is commanded rich for more than a calibrated amount, DTC P2097 or P2099 sets.


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P0174 Generic Definition

Fuel Trim Bank Two Condition
- The ECM has detected a rich or lean air/fuel ratio condition on engine bank two

Probable Cause[s]

  1. If bank one and two are set together suspect a fuel pressure condition or MAF sensor fault
  2. Failed HO2S21
  3. Ignition misfire condition
  4. Fuel injector problem
  5. Engine mechanical condition




    P0171 Generic Definition

    Fuel trim bank one condition
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    Probable Cause[s]

    1. If bank one and two codes set together suspect fuel pressure or MAF (Mass Air Flow) Sensor
    2. Oxygen sensor defective
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      Find the cause of overly rich fuel condition. Over fueling will also cause running problems you are experiencing.

      You need to check the Short Term Fuel Trim with a scanner. If higher than -12% you have an injector staying open too long or too high fuel pressure.

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      IMPORTANT:
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