2010 Mitsubishi Lancer Repeat P0133 Code

Boruch Owner Ohio Posted   Latest  
Delayed
Driveability
2010 Mitsubishi Lancer GTS 2.4L (W 4B12) (F1CJA) — JA32U8FW3AU023983
P0133 — O2 Sensor Circuit Slow Response Bank 1 Sensor 1
Repeat P0133 Code

We had a 2010 Lancer come in a couple of months ago and it had a P0133 code stored. It is for slow response B1S1. We verified that the sensor was indeed not switching fast enough and in fact would stick and then start moving again. We replaced the sensor and all seemed good. The client came back a couple months later with the same code. We checked a little further and found a TSB for reprogramming (should have researched that first!). Did the reprogramming and now the client is back about a month later stating the the CEL comes on intermittently. It has the same code P0133. He states that it only does it on hot days when the engine is good and hot too. It's been cool the last few days so we can't reproduce the conditions. We have checked in the shop for leaks in the exhaust using pressurized (30psi) air and can't find any exhaust leaks. I am wondering if there is some crack or gasket that is opening when the exhaust is very hot. I am hoping one you folks that works on more Mitsubishi's than I do can help here. I also want to add that it has California emissions and has 3 oxygen sensors. The one we are dealing with is the furthest upstream. The replacement we used is a Denso P/N 234-4188. I talked with Denso Technical Support and gave them the Mitsubishi P/N 1588A140 and they stated that they are the actual OE for that part for Mitsubishi. I would replace it with an OE sensor if I thought that would help but besides for having a list price of $509!! I really don't think that's my issue. When watching the scan data we get the requisite 8 lean-rich switches in 10 seconds. It seems the code only sets under the specific circumstance of hot engine and hot ambient temps. I would appreciate any advice you guys and girls could offer. Thanks in advance!

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Dan Owner/Technician
Texas
Dan
   

… Here is one with a big discount … OE : mitsubishidirectparts​.​com/oem-parts/mits… You might try less air pressure and a better bubble solution from an A/C supply house ie:…Big Blue … You can make some money going with that one and maybe fix the car… Dan H. … Hobbs … South Texas …

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Nate Owner
California
Nate
 

I don't know if this is relevant, but Worldpac lists the Denso 234-4116 as the correct Upstream oxygen sensor.

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Boruch Owner
Ohio
Boruch
 

That is interesting! I will check that out in the am. Funny thing is I was worried that with it having 3 sensors, we might have got the wrong one so I called tech support. He verified the sensor but I have a lot of faith in worldpac catalog. It is the best I’ve ever used. I will look it up there. Thank you!

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Timothy Owner/Technician
Wisconsin
Timothy
 

Remember that later model vehicles have much tighter calibrations than an AM sensor. They are also patented, so you cannot sell the same sensor to the AM, that you sell to the OEM without a licensing fee being paid (usually), so the cost gets very close to the OEM price. WorldPac is just another AM distributor of parts, and I've found several counterfeit parts over the years, especially in the…

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Jose Owner/Technician
California
Jose
 

Can a lazy rear O2 sensor make the upstream do extra work? Don't have any problems, just curious!

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Timothy Owner/Technician
Wisconsin
Timothy
 

It would have to be biased in a certain way, for it to greatly affect the front, but I have seen it happen a number of times. The PCM in some vehicles, but ALL OEs to some extent, will go to extremes to keep catalyst codes from setting. Which indicates some part of the trim calculation is based on the rear sensor reading. So, the rear, or something affecting what the rear is seeing, can cause…

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Alberto Mechanic
Florida
Alberto
 

I agree with Tim on that. It is true the both the upstream o2 and the the downstream o2 work together. Specially on the mitsubishi, the Rear o2 play a major role in the functionality on the fron o2 or o2 's. Depending on the mileage it is always advice to change front and rear together as a high mileage rear o2 can hinder the functionality of the front one.

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Boruch Owner
Ohio
Boruch
 

Thanks Alberto and Timothy, that is actually a great piece of information. I have had a number of times, especially on Toyota, where the downstream oxygen sensor is the culprit for setting A/F sensor codes. This being a California Emissions model has three sensors. NTK uses the same part number for both the Front and Center sensors which tells me that they function in much the same way…

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Boruch Owner
Ohio
Boruch
 

Nate, I looked into it this morning. According to Denso's site that is the middle sensor between the primary and secondary cat. I appreciate your help though

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Boruch Owner
Ohio
Boruch Update
 

This afternoon, I drove the car quite a bit today while monitoring mode 6 data. Since it’s intermittent, I wanted to see what conditions it registered a failure even if the light didn’t come on. I drove on the roads at about 40mph trying to maintain the monitor conditions. I noted that the minimum parameter for test failure was a frequency of 8 switches in 10 seconds. At highway speeds the…

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Boruch Owner
Ohio
Boruch Delay
 

I ordered both the center and downstream sensors. Client will return in another week or so for the repairs. Thank you guys for the information. I will update if once I’ve made the repairs.

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