P1133 Code

Frustrating Issue with My 2001 V6 Tacoma

-Threw a Code a while back and it was p1130 and p0171. I eventually changed both O2 Sensors (Denso), MAF Sensor (Denso), Air Filter (aFe), Fuel Filter (Fram) and I drove it about 100 mi and the CEL went off. 2 days later it keeps coming on and giving me the p1133 code. Kind of frustrated on what it could be or how to check other things to find the source of this code.

Any help is appreciated.

 

Also note that truck runs perfectly fine when the CEL is on or off. Car does not try to stall or act weird at all.

 

I would refer 1130 to a defect maf but you changed that too. Maybe a leak in the intake tube that is not getting measured? That can also trigger 0171 for lean.

Check vacuum hose etc. Most commonly missed inspection is the driver side valve cover vacuum hose by the fire wall going to intake tube. Worrh checking.

Also check for exhaust leak

 

''P1133
A/F Sensor Circuit Response Malfunction (Bank 1 Sensor 1)

... and the probable fault areas identified in the 2001 FSM are as follows:

- Open or short in A/F sensor circuit
- A/F sensor
- Air induction system
- Fuel pressure
- Injector
- ECM''


Re-check everything you just did and make sure there are no air or vacuum leaks.

 

Super Weird. I checked for vacuum leaks and cracks in the system and no luck finding anything. I deleted the code to see how long itd take to go on and this time it came on with a p1130 code and p1133. I know the symptoms from both, but is there anything that you guys have had that commonly sets both codes off?

Thanks in advance for all the help.

 

You probably had 1 error that is triggering 2 code, which is fairly common on obd2 system

 

Damn, this is going to be a long search. haha

 

I'd recommend having a shop smoke test it for vacuum leaks. And check fuel pressure like another member previously said. You've got something keeping your engine from being able to see the O2 sensors switch

 

Do you have a scan tool that shows data or just reads codes. All you are going to do in the following is verify that your new part is indeed working, new stands for Never Ever Worked... If it shows data pull up bank 1 sensor 1 and put it on a graph. Not to pick nits... you said you replaced both o2 sensors... your truck should have a front A/F sensor and not an oxygen sensor, they are different and operate differently, she should have a post cat o2 sensor. Start her and warm her up and get a propane torch, do not light it, open it up and stick it in under the air filter. You might have to rev the motor to keep her running. Look at the bank 1 sensor 1 readings when the propane gets there, does the reading change? if so, the A/F sensor is working and your problem lies else where.

 

Just curious, where did you get your MAF at? If you got it off ebay, it could possibly be the issue. Also, if you have a scan tool. Check your fuel trim numbers so, you can start by ruling out weak or failing fuel pump. And. mileage on your truck?

 

I got my MAF off Amazon from Denso. I made sure to use all OEM parts. Honestly, I think it could be fuel related because I unfortunately have ran the tank down to E (never ran out of gas) and that probably put a ton of strain on the pump. I have 128k miles on the truck.

 

Ok, the Denso you got off Amazon. Did it come in a Denso box? And is this part number on the box & on Maf (

$158 22204-21010 Internal Air Flow Meter

22204-21010)? If so, you got a real Denso part. If, you have this number on box & Maf (

$103 22204-22010 Intake Meter Sub-Assembly

22204-22010) you got a knock off like I got off ebay. It came in a Denso box also and was the cause of some of my issues a few months ago.

A scan tool and checking live data should be a big help for you in solving the issue. You can see if your new A/F sensor is working properly. I think it should be a steady 3 something volts. Plus you can see your long & short fuel trims +10 to -10 on both indicate normal fuel pressure. The post by
skedrc would be a good check list to start with.

 

I got the denso maf box and the only number on it is

$70 197-6020 Mass Air Flow Sensor, Regular

197-6020. Both RockAuto and Amazon say this is the right denso part # for the tacoma. Is that the right one? I'll look at skedrc's page and see his checklist! I appreciate the help.

 

should have it stamped on the flat part of the sensor The number you have is not the number I go by. But, that doesn't mean yours inst a real Denso. Look on your sensor for this number...

$158 22204-21010 Internal Air Flow Meter

22204-21010

 

I just looked and it does not have any OEM stamps on it which means it was probably just a rebranded denso product. The original MAF that i still have on my shelf read out "22204-07010" so i am not sure why it does not end in 21010....what do they produce the 22010 for? as i see that is all over ebay/Amazon. I will definitely be searching for a 21010 to replace this sensor.

 

if you had both p0171 and p1133, that's because you had a bad front sensor (sensor is bad and it can't read emissions properly, so truck thinks it has lean issues and throws code)

you say you replaced that front sensor, but are you sure you put an air/fuel ratio sensor instead of a regular o2 sensor?
on 2000 and later trucks, the front sensor is an air/fuel ratio sensor
on 1999 and earlier is a regular o2 sensor

I did this error and it popped me a 113x error (can't remember the last digit).

What's the part # of the front sensor you installed?

 

The 22010 are priced very cheap anywhere from $17.99 to 39.99. I bought one in Feb 17 and in 1 year and a half I was having issues. I bought a used 21010 off ebay. Cleaned it up , installed it and my issues were gone and the truck runs great again. To me, the 22010 means lesser quality.

 

I believe in Volks starting post he mentions he replaced both o2 sensors. Which, you are correct. The upstream is called air/fuel sensor. Many people still call them o2 sensors. I am assuming he got the right upstream sensor. Automatic is

$146 234-9001 Upstream Air Fuel Ratio Oxygen Sensor with 10.6” 4-Wire Harness, for Auto Trans Equipped Vehicles

234-9001 and manual

$170 234-9003 Air Fuel Ratio Sensor

234-9003. Why there is a need for 2 different numbers...I have no clue.

 

Not sure why all the talk about vacuum leaks or the MAF when you're not getting a LEAN code anymore. You are getting a toyota specific malfunctioning sensor code.

Either you put the wrong sensor in as this other user mentioned below or it was an open/shorted wiring issue all along.

 

Good point bsedgal. I just got stuck on getting information I felt important to get on here. I did notice Volks no longer mentioned the lean code. That is why in my post #12 at the end I wrote this: "The post by
skedrc would be a good check list to start with."