[AngeloDelbro]

Do you have a check engine light? If so, you need to get a code reader (autozone will scan it for free for you) and have them give you the OBD2 code its throwing. Then we can narrow it down more.

Hey, Limp mode and engine light went away for almost 1 month but now it's back. Today I'm going to run a scanner on it to see which code specifically it's popping up. Let you know later today.

 

[AngeloDelbro]

this is what the scanner got. any cheap fix or it has to be the complete cat?

 

[Spdbump]

View attachment 60599 this is what the scanner got. any cheap fix or it has to be the complete cat?

I would think damaged O2 sensors or clogged , damaged or removed Catalytic converters but would have to check the Factory Service manual for the correct diagnosis process for each code to know for sure.

 

[litz]

If the p0420 is the only code you're getting, the first thing to check is that you have good quality fuel. I figure that's a long shot, but possible. I haven't had that code myself, but just going from the service manual, and they jump right into installing a new (expensive) catalytic converter as a test for the failed cat. Nothing like a service manual / system that wants you to throw parts at the problem. <grrrrrrr>
Perhaps someone who's had the the problem before can chime in--sorry for the lack of an easy/cheap fix, other than clean/quality fuel.

 

[Spdbump]

Litz, if this was yours would you try something like a high quality fuel system cleaner or Seafoam or one of the emissions cleaners, etc?

If the p0420 is the only code you're getting, the first thing to check is that you have good quality fuel. I figure that's a long shot, but possible. I haven't had that code myself, but just going from the service manual, and they jump right into installing a new (expensive) catalytic converter as a test for the failed cat. Nothing like a service manual / system that wants you to throw parts at the problem. <grrrrrrr>
Perhaps someone who's had the the problem before can chime in--sorry for the lack of an easy/cheap fix, other than clean/quality fuel.

 

[litz]

Litz, if this was yours would you try something like a high quality fuel system cleaner or Seafoam or one of the emissions cleaners, etc?

Yes, or at least (clear all codes and) run a "Top Tier" brand of gas for a couple of tank fulls before forking out any money for a new part to "test" a theory.

 

[litz]

Another issue that I'd check into, is with the o2 sensor and wiring/connector itself. One thing that I tend to do with wire connectors that I have removed/unclipped for some reason or another, is to put a little dab of dielectric grease into the back of the connectors where the wires enter. But, make sure you DON'T do that! As I understand it, the o2 sensor wire path needs a clear passage for air--clean, outside air--to enter the sensor chamber for its comparison of o2 in the exhaust flow. Putting dielectric grease or extra electrical tape around the connectors with defeat the proper function of the sensor/wiring. [Any professional tech/mechanic out there is invited to clear my thinking on this issue, if necessary.]

 

[hispanoamericano1]

Had the same issue. Car was on Lim Mode, check engine light about Emission system and all got clear after I went to a gas station, got some gas treatment, drove the car for about an hour. First the check engine went away, then next day all driving modes are back in service. Thanks all for all the tips.