Traditional gasoline car fault

2002 Mustang GT P0171 and P0174 Codes: Causes and Solutions

I own a 2002 Mustang GT with 61,000 miles and have been consistently receiving P0171 and P0174 diagnostic trouble codes. I've already replaced both the before- and after-oxygen ...

02 Mustang GT | P0171

p0171, p0174, p0303, p0304 1999 Ford Windstar

These four codes came up during my emissions test. One seems to indicate possibly faulty wires or compression. Is there anything specific I should look for. My larges fear i...

1999 Ford Windstar | P0171

2000 Ford Crown Victoria P71 - OBD2 Codes P0174 and P0171, Rough Idle After Start, MAF and EGR Replacement

I own a 2000 Ford Crown Victoria P71 with 60,800 miles. Previously used as a marked cruiser, it's now deployed as an EMS 'fly car' for rapid response. While driving to an emerg...

2000 Crown Victoria | P0171

PO 174 Code on 1998 Ford Expedition 4.6L: Causes, Diagnosis & Fixes

I own a 1998 Ford Expedition with 105,000 miles that has recently triggered the PO 174 diagnostic code (System Too Lean Bank 2). I cleared the code, but it returned within a few...

98 Expedition | P0174

P0171 and P0174 Fault Codes on 2001 Cadillac Deville - Lean Mixtures and Idle Issues

I recently received check engine light activation accompanied by OBD-II fault codes P0171 and P0174 on my 2001 Cadillac Deville. The car has 62-000 miles on the odometer. I had ...

2001 Cadillac Deville | P0171

2004 Ford Taurus 3.0L V6 P0174 and P0191: Check Engine Light On, Loss of Throttle Response at Highway to City Speed Changes

I have a 2004 Ford Taurus with a 3.0L V6 engine. Recently, the check engine light came on, and I noticed a severe loss of throttle response—especially when transitioning from hi...

2004 FORD TAURUS | P0174

1999 Mercury Cougar P0171 P0174 P0401 and P1405: Causes and Repair Guidance

I brought my 1999 Mercury Cougar (V6) to a friend's shop, where their scanner detected the following OBD2 fault codes: - P0171: System too Lean (Bank 1) - P0174: System too Lea...

99 Mercury Cougar | P0171

2001 Ford Windstar P0171 and P0176: Intake Manifold Gasket Failure & Lean Codes After Repair

I leased a 2001 Ford Windstar for two years before purchasing it, which gives it a solid maintenance history. The check engine light first appeared in late 2004. I drove the veh...

2001 Windstar | P0171

P0171 & P0174 tried lots of things, on coming 04 Tahoe

Ive tried cleaning the MAS with CRC MAS Cleaner, Throttle Body and still keeps on returning. Truck runs fine but I'd like to fix the problem when I could find the culprit. Deale...

04 Tahoe | P0171

P0174 O2 Sensor Issue and Poor Fuel Economy on 2001 Nissan Frontier SE 6CL

I have already replaced the MAF sensor, but my fuel efficiency remains around 12 miles per gallon and the check engine light is still illuminated. The light occasionally turns o...

6CL 01 Frontier SE | P0174

P0171 & P0174 Diagnosis for 1999 Ford Explorer V6 - Oxygen Sensors, MAF, and Vacuum Leak Solutions

I own a 1999 Ford Explorer 4x4 with a 148,000-mile V6 OHV engine. The vehicle has been well-maintained: oil changes every 3,000 miles using synthetic oil, a K&N air filter insta...

Ford Explorer | P0171

P0171, P0174, and P0304 Faults in 2000 Lincoln LS V6: Causes and Fixes

I own a 2000 Lincoln LS with a V6 engine that has been running roughly for some time, and the service engine light has remained on. After retrieving diagnostic codes, I found P0...

Lincoln LS V6 | P0171

1999 Ford F-150 5.4L Engine Light On with P0171 and P0174 Codes After MAF Sensor Replacement

The service engine light has come on, displaying trouble codes P0171 and P0174 on my 1999 Ford F-150 with a 5.4L V8 engine. I recently replaced the Mass Airflow (MAF) sensor two...

99 F-150 | P0171