Problem with check engine light

04mch1 · Apr 6, 2005

I have an 04 mach 1 and the check engine light is on. There are two codes comming up they are p1406 and p0133 (see below). I have removed the cats and installed an off road x pipe with MIL eliminators. I have replaced the upstream o2 sensors twice. Please help!

P1406-Differential Pressure feedback electronic sensor circut downstream hose. What is this?

p0133-bank one sensor one slow response.

sgarlic · Apr 6, 2005

04mch1 said:
I have an 04 mach 1 and the check engine light is on. There are two codes comming up they are p1406 and p0133 (see below). I have removed the cats and installed an off road x pipe with MIL eliminators. I have replaced the upstream o2 sensors twice. Please help!

P1406-Differential Pressure feedback electronic sensor circut downstream hose. What is this?

p0133-bank one sensor one slow response.

That first code, P1406, is related to the EGR system. It says check the downstream hose for proper connection. Also, check the hose for plugging (ice is the given example), or plugged or damaged EGR tube.

The second one, P0133 is referring to the pre-cat passenger side o2 sensor) Check the system for exhaust leaks, shorted wiring, or contamination of the o2 sensor itself.

jamez1502 · Apr 6, 2005

i am having the same problem after o/r x install i am going to have to get it burn on a chip because mil eliminators dont always fix the problem

jstreet0204 · Apr 6, 2005

jamez1502 said:
i am having the same problem after o/r x install i am going to have to get it burn on a chip because mil eliminators dont always fix the problem

If you don't have any leaks (exhaust or vacuum), bad wiring, or bad mil eliminators, the mil eliminators should fix the problem they are meant to fix. Track down the issue before you go getting a chip burned just for that or you may end up spending 300 and still have the same issue.

bdcardinal · Apr 6, 2005

jamez1502 said:
i am having the same problem after o/r x install i am going to have to get it burn on a chip because mil eliminators dont always fix the problem

if you are getting the same code, i hope to god that the MIL eliminators dont fix the code. the MILs only go on the rear O2 sensors, not the fronts. the front O2s moniter rich/lean while the rears moniter catalyst efficiency.

as for the O2 code, i would say just replace the O2 sensor. how many miles are on the car? have you had any coolant loss problems or oil consumption problems?

Problem with check engine light

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