Trouble code P1131 means: Lack Of HO2S11 Switches - Sensor Indicates Lean
The engine is running lean www.obd-codes.com this will help .
P1151 and obd fault code solution for a 97 ford ranger
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Trouble code P1131 means: Lack Of HO2S11 Switches - Sensor Indicates Lean
The 2004 Ford Ranger OBD 2 port is under dash below or left of steering column
A 1990 Ford Ranger is OBD I / EEC IV - if that's what you are asking
yes
Trouble code P0133 means: O2 sensor circuit,slow response (bank 1,sensor 1)
1993 is OBD-1. 1998 and newer are OBD-2. actually , 1996 and newer are OBD II
On the OBD-II DTC website, they stated that the code is "Ignition Diagnostic Monitor Pulsewidth Not Defined." More research will be needed to clarify what exactly this means.
A 1994 Ford Ranger is OBD I / EEC IV and has an EEC TEST connection in the engine compartment by the power distribution box In 1996 , the Ford Ranger changed from OBD I / EEC IV to OBD II / EEC V and has a Data Link Connector in the dash , below the steering wheel , covered by a small removable plastic panel
Most under dash driver's side. There isn't an OBD port on a 1986 ranger!!