I have a 1993 Ford ranger XLT extra cab 4.0 and I got a code 411 and a code 1 3 6 I was wondering if anybody can help me identify what would fix those codes. Thank you very much for any assistance.

 

You should post the definitions with the codes since I assume you already looked them up

Also what are the symptoms if any?
Is engine stumbling?
Running OK
MPG is down?

Was the CEL(check engine light) on, or did you just want to check codes?

136 (R) Oxygen sensor not switching/system lean Left or Front HO2S - Fuel control

Could be a vacuum leak on drivers side of engine or exhaust manifold leak on that side
Fuel injector on drivers side could be plugged up or not working
If O2 sensor on drivers side has over 150k miles then change it

411 (R) Idle speed system not controlling idle properly (generally idle too high) - ISC

When you start the engine cold, does the idle go up to 1,100 or so, then drop down as engine warms up?
If it does then IAC Valve is working, not stuck.
If it doesn't do that then IAC valve needs to be cleaned or replaced

If IAC Valve is working then most likely a vacuum leak is causing the higher warm engine idle
With engine warmed up and idling, unplug the 2 wire connector on the IAC Valve
RPMs should drop to 500 or engine may even stall, either is good, no vacuum leaks
If RPMs do not drop then there is a vacuum leak, you will need to find it
Because of code 136, Check drivers side lower intake first


And always.................Clean MAF sensor, ever year, solves alot of problems for the 4.0l OHV, also other engines as well, lol

 

Thank you for the information and the help next time I need your help I will include all the information you requested. Again thank you very much.