1999 Jeep Cherokee Limited 4.0L Poor Fuel Economy, MIL Lamp on
Came in for Codes P0171 System too lean, P0131 Upstream O2 Voltage too low, P0138 Downstream O2 too high. Replaced both sensors and has same problem. The rear O2 is working correctly, 5 volts KOEO and 1 Volt running. Open Loop CO is good 2-3 %. Closed Loop CO ...
FIX posted 2/16/2010
iATN Members:
Login to view full TechHelp request Auto Repair Pros: Join iATN to read this TechHelp request Vehicle Owners: Find a nearby iATN member to repair your vehicle 3 Replies Received (View Replies)3 Replies Received (Hide Replies)Related Documents & MediaRelated Documents & Media |
Message Closed w/FIX
Vehicle Data1999 Jeep Cherokee Limited
Trouble Codes
|
Message Closed w/FIX
Vehicle Data
1999 Jeep Cherokee Limited
VIN | 1J4FF68S6X |
Engine | 4.0 L / 6 cyl / GAS |
Trans | 4-speed Automatic (Electronic) |
Delivery | FI |
Emissions | OBD-II Compliant |
Symptoms | Poor Fuel Economy, MIL Lamp On |
Occurs | Closed Loop |
Trouble Codes
P0171 | Fuel System Too Lean (Bank 1) |