P2698 — Exhaust Aftertreatment Fuel Injector "A" Performance
P2698 — Exhaust Aftertreatment Fuel Injector "A" Performance. A fault in the fuel delivery and mixture control. Short, gentle driving to a shop is usually possible. Typical causes: contaminated or incorrect fuel, weak fuel pump or clogged fuel filter, clogged or leaking fuel injectors.
powertrain (engine/transmission)
Is it safe to drive?
Drive with caution Drive with caution. Mixture and fuel-pressure faults can cause stalling, hesitation in traffic and — when severe — catalyst damage. Avoid long trips until diagnosed.
How to diagnose with an OBD scanner
- Read the code and freeze frame Connect an OBD2 scanner, confirm P2698 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
- Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
- Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the fuel delivery and mixture control for damage, corrosion, chafing or poor contact.
- Subsystem check Measure fuel pressure at the rail and compare with factory specification at idle and under load.
- Subsystem check Check short-term and long-term fuel trims in live data to see which way the mixture is off.
- Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P2698 does not return.
Approximate repair cost
Repair cost depends on which component actually failed. Typical scenarios for P2698 (parts and labor, USD, independent shop rates): Replace the fuel filter: $80–$200; Replace the pressure regulator or sensor: $150–$450; Clean or replace injectors: $200–$800; Replace the fuel pump: $400–$900. Overall, fixing P2698 usually costs between $80 and $900. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.
Common questions
What are the symptoms of P2698?
Drivers most often notice: rough idle and hesitation, fuel smell in severe cases, increased fuel consumption, Check Engine Light on.
How much does it cost to fix P2698?
Replace the fuel filter — $80–$200; Replace the pressure regulator or sensor — $150–$450; Clean or replace injectors — $200–$800; Replace the fuel pump — $400–$900. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.
What does OBD2 code P2698 mean?
P2698 — Exhaust Aftertreatment Fuel Injector "A" Performance. A fault in the fuel delivery and mixture control. Short, gentle driving to a shop is usually possible. Typical causes: contaminated or incorrect fuel, weak fuel pump or clogged fuel filter, clogged or leaking fuel injectors.
What is the most common cause of P2698?
The most common causes are: contaminated or incorrect fuel, weak fuel pump or clogged fuel filter, clogged or leaking fuel injectors.
Is it safe to drive with P2698?
Drive with caution. Mixture and fuel-pressure faults can cause stalling, hesitation in traffic and — when severe — catalyst damage. Avoid long trips until diagnosed.
What does P2698 mean?
Seeing P2698 on your scanner? The control unit has caught the fuel delivery and mixture control operating outside its calibrated window. The formal description is “Exhaust Aftertreatment Fuel Injector "A" Performance”, and the code is grouped under powertrain (engine/transmission) faults.
The module monitors this system continuously while driving. When readings fall outside the expected range for a defined number of drive cycles, it stores P2698 and switches on the warning light. Freeze frame data saved with the code shows the exact conditions — rpm, load, temperature, speed — at the moment the fault was detected, which is the best starting point for diagnosis.
What causes P2698?
- contaminated or incorrect fuel
- faulty fuel pressure regulator
- faulty fuel rail pressure sensor or wiring
- vacuum or intake leaks skewing the mixture
- clogged or leaking fuel injectors
Common symptoms of P2698
- rough idle and hesitation
- fuel smell in severe cases
- increased fuel consumption
- Check Engine Light on
- loss of power under load
- hard starting or long cranking
How to diagnose P2698
- Connect an OBD2 scanner, confirm P2698 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
- Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
- Visually inspect the wiring harness and connectors related to the fuel delivery and mixture control for damage, corrosion, chafing or poor contact.
- Measure fuel pressure at the rail and compare with factory specification at idle and under load.
- Check short-term and long-term fuel trims in live data to see which way the mixture is off.
- Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P2698 does not return.
How to fix P2698
Start with the cheapest and most common causes before replacing expensive parts:
- Replace the fuel filter — $80–$200
- Replace the pressure regulator or sensor — $150–$450
- Clean or replace injectors — $200–$800
- Replace the fuel pump — $400–$900
How much does it cost to fix P2698?
Repair cost depends on which component actually failed. Typical scenarios for P2698 (parts and labor, USD, independent shop rates):
- Replace the fuel filter: $80–$200
- Replace the pressure regulator or sensor: $150–$450
- Clean or replace injectors: $200–$800
- Replace the fuel pump: $400–$900
Overall, fixing P2698 usually costs between $80 and $900. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.
Can you drive with P2698?
Drive with caution. Mixture and fuel-pressure faults can cause stalling, hesitation in traffic and — when severe — catalyst damage. Avoid long trips until diagnosed.