Traditional gasoline car fault

1996 Mazda B2300 P0301 and P1131 Fault Codes: Diagnosis and Fixes After Tune-Up

Hi everyone, I'm having trouble with my 1996 Mazda B2300 (equipped with a Ford Ranger engine) that's showing two diagnostic trouble codes: P0301 and P1131. I recently performed...

1996 Mazda B2300 | P0301

Recurring P1131 and P1151 Fault Codes on 2002 Roush Mustang Stage II - How to Fix Rough Idle and Rich Exhaust?

I own a 2002 Stage II Roush Mustang that has been showing recurring OBD-II fault codes: P0171, P0174, P1131, and P1151. After replacing both upstream HO2 sensors, the MAF sensor...

Roush Mustang | P1131

1997 Ford Escort P1443 and P1131 OBD2 Codes: Causes, Diagnosis, and Fixes

My 1997 Ford Escort (2.0L manual transmission) has been intermittently throwing the P1443 and now also P1131 fault codes. Recently, the car began running rough at stop signs and...

1997 escort | P1131

P1131, P1151, P0174, P0304, P0306 - Diagnosis and Fixes for 2000 Ford Expedition with 145K Miles

I'm experiencing multiple OBD-II fault codes on my 2000 Ford Expedition: P1131, P1151, P0174, P0304, and P0306. The vehicle has accumulated 145,000 miles and is running roughly,...

2000 Ford Expedition | P0174

2002 Mazda 626 V6 Engine Shaking with P0133, P1131, and P0305 OBD2 Codes - Diagnosis & Component Locations

2002 Mazda 626 LV, 2.5L V6, Automatic Transmission, 185,000 miles My 2002 Mazda 620 has been experiencing intermittent shaking, especially when climbing hills. The Check Engine...

2002 Mazda 626 | P0133

1999 Mazda 626 V6 Missfire Diagnosis: Codes P0400, P1131, P0174 - EGR, Intake Gasket, or Injector Issues?

My 1999 Mazda 626 V6 is experiencing a severe missfire on cylinders #2 and #6. After testing with four different diagnostic scanners, I received codes P0400 (Exhaust Pressure Se...

1999 Mazda 626 | P0174

P1131 Fault Code Explanation and Location for 2002 Mazda 626 V6 2.5L

The other day my 2002 Mazda 626 V6 2.5L triggered a P1131 diagnostic trouble code: 'HO2S Bank 1 Sensor 1 - Signal Below 0.45V (Air/Fuel Ratio Too Lean)'. I haven't noticed any d...

Mazda 626 | P1131

P1151 and P1131 Fault Codes - 2003 Ford Expedition XLT 4.6L Engine Diagnosis

The vehicle exhibits rough idle when reaching approximately 165°F engine temperature, despite confirmed good MAP sensor readings, new Bosch O2 sensors, fresh IAC valve and spark...

2003 Ford Expedition XLT | P1131

2001 Ford Taurus 3.0L V6: P0401, P1131, P1151, P0304 Diagnosis - MAF Cleaning or Larger Engine System Issue?

I'm experiencing multiple diagnostic trouble codes on my 2001 Ford Taurus 3.0L V6: P0401 (Exhaust Duct Flow Malfunction), P1131 (O2 Sensor Bank 1 Sensor 1 Slow Response), P1151 ...

2001 ford taurus 3.0v6 | P0304

1999 Mercury Sable P1131 Check Engine Light - How to Fix Without Spending $150 on O2 Sensors?

My 1999 Mercury Sable has the check engine light on, and I've pulled code P1131. After researching, I've tried replacing the mass air flow (MAF) sensor and gas cap—both new—but ...

1999 Mercury Sable | P1131

1999 Mercury Cougar P1131 O2 Sensor Code: Causes and Fixes

Hi everyone, I'm looking for help with a persistent check engine light on my 1999 Mercury Cougar. The diagnostic scan shows code P1131 — 'O2 Sensor 1 (Bank 1) Indicates Lean Con...

99 Mercury Cougar | P1131

2000 Ford Focus SE P0171 and P1130 Diagnostic: Sputtering, Slow Acceleration, and O2 Sensor Location Help

I've been experiencing persistent sputtering and slow acceleration in my 2000 Ford Focus SE over the past few weeks. The issue worsens at steady speeds between 40-55 mph, giving...

2000 Ford Focus | P0171

2002 Ford F150 P0401/P0402/P1131/P1151/P0171 Diagnosis: DPFE Sensor, O2 Sensors & Emission Test Failure Fix

I own a 2002 Ford F150 with over 125,000 miles. Due to state emission regulations, vehicles older than two years must undergo annual emissions testing. This vehicle has failed i...

02 F150 | P0171

How to Fix OBD2 Code P1131 in 2000 Ford F150: Meaning and Solution

Does anyone know what OBD2 diagnostic code P1131 means for a 2000 Ford F150? The code indicates 'Lack of Upstream Heated Oxygen Sensor Signal - Sensor Indicates Lean' condition....

2000 F150 | P1131