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P0138, P0141, P0171 Fault Codes on 1996 Jeep Grand Cherokee - Stalling at Idle and Stop

Model: 1996 Grand Cherokee Fault Code: P0138 Posted: 2017-01-30 19:16

I own a 1996 Jeep Grand Cherokee with a newly installed 4.0L inline-6 engine. The vehicle is now displaying fault codes P0138, P0-141, and P0171. Whenever I try to idle, turn the wheel, or stop, the car stalls approximately 99% of the time. I'm looking for affordable troubleshooting steps since I'm on a tight budget and am self-taught in automotive repair. I've done some research but need clear, step-by-step guidance that doesn't require expensive tools or parts. The engine is stock (original 4.0L L6 VIN S Auto), so any solutions should be compatible with standard DIY fixes.

Related fault codes

P0138P0141P0171

Comments (3)

Anonymous 2017-01-31 10:19

P0171 (4.0L L6 VIN S Auto) - Fuel System Lean (Bank 1) >>> Start by checking for vacuum leaks — use the classic carburetor spray test to locate any leaks. P0138 (4.0L L6 VIN S Auto) - O2 Sensor (Bank 1, Sensor 2) Circuit Short to Voltage P0141 (4.0L L6 VIN S Auto) - O2 Sensor (Bank 1, Sensor 2) Heater Circuit Fault These issues likely stem from damaged wiring harnesses or pinched connections during engine installation. Check the wiring at both sensors — look for fraying, kinks, or physical damage. If you can read wiring diagrams and have access to a digital multimeter (DVOM) or test light, these diagnostics will help identify the root cause.

Anonymous 2017-01-31 10:23

I hate wiring diagrams too — but I’ve learned to use them over time. In my case, I discovered that a vacuum hose connecting the air intake to the valve cover was cut by a previous shop. They replaced it with a mismatched piece of tubing, which caused a significant vacuum leak and directly contributed to the stalling issue.

Anonymous 2017-01-31 11:15

So far — has P0171 been resolved? Has the stalling problem improved or disappeared? The O2 sensor faults are manageable with step-by-step guidance, but let’s focus on fixing drivability first. P.S. The 4.0L engine is reliable and easy to work on — especially if it's a stock setup. Always confirm you're working with the original (stock) components.