P1133 Mercury Code - Bank 1 Fuel Control Shifted Lean
Quick Answer
P1133 Mercury indicates Bank 1 Fuel Control Shifted Lean. Common causes include Faulty HO2S11, Faulty Mass Air Flow (MAF) sensor, Fuel system malfunction. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1133 Mercury indicates Bank 1 Fuel Control Shifted Lean.
- Common causes
- Common causes include Faulty HO2S11, Faulty Mass Air Flow (MAF) sensor, Fuel system malfunction.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P1133 Mercury Description
What are the Possible Causes of the DTC P1133 Mercury?
- Faulty HO2S11
- Faulty Mass Air Flow (MAF) sensor
- Fuel system malfunction
- HO2S11 harness is open or shorted
- HO2S11 circuit poor electrical connection
How to Fix the DTC P1133 Mercury?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1133 Mercury code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P1133 Mercury Code
1. What does the OBDII code P1133 mean for a Mercury vehicle?
P1133 indicates that the fuel control system for Bank 1 is running too lean, meaning the air-fuel mixture has too much air and not enough fuel.
2. What are the common symptoms of the P1133 code on a Mercury?
Symptoms may include a check engine light, rough idle, decreased fuel efficiency, hesitation during acceleration, or lack of engine power.
3. What causes the P1133 code in a Mercury?
Common causes include a faulty oxygen sensor, vacuum leaks, intake manifold gasket leaks, fuel delivery issues, or a malfunctioning mass airflow (MAF) sensor.
4. Can a bad oxygen sensor trigger the P1133 code?
Yes, a faulty or failing upstream oxygen sensor on Bank 1 can cause inaccurate readings and lead to the P1133 code.
5. How do I diagnose the P1133 code on a Mercury?
Start by checking for vacuum leaks, inspecting the oxygen sensor wiring, testing the MAF sensor, and verifying proper fuel pressure with a fuel pressure gauge.
6. Can a dirty MAF sensor cause the P1133 code?
Yes, a dirty or malfunctioning mass airflow sensor can give incorrect air readings, causing the engine to run lean and trigger the code.
7. Is it safe to drive my Mercury with the P1133 code?
While the vehicle may still be drivable, prolonged driving with this code can cause damage to the catalytic converter or other engine components.
8. What repairs can fix the P1133 code on a Mercury?
Possible repairs include replacing the oxygen sensor, cleaning or replacing the MAF sensor, repairing vacuum leaks, or addressing fuel delivery issues.
9. How much does it cost to fix the P1133 code on a Mercury?
The cost can vary depending on the issue, ranging from $100–$300 for an oxygen sensor replacement to higher costs if additional repairs are needed.
10. Can a clogged fuel injector cause the P1133 code?
Yes, a clogged or malfunctioning fuel injector can restrict fuel flow, causing a lean condition and triggering the P1133 code.
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