Recent content by Yisroel K

Which sensors are the correct one I looked up a few on Amazon and it said it does not match the car. I have one cat so I'm assuming not Cali rated. Do I need a a/f sensor and o2 sensor or 2 o2 sensors?

My short trim was a steady 19.5% Long trim was a steady 39.8% Maf about 4 g/s when accelerated it went up so don't think maf is bad. O2s1b1 was reading 0.645v O2s1b2 was reading 0.000 - 0.005v

I checked for vacuum leaks with a Halloween smoke machine and didn't see or hear any leaks. My downstream o2 sensor after my cat is not reading any volts on a obd2 I tested my upstream af sensor and it had ohm reading of 15 v. I forgot to test the o2 sensor.

Hi guys I believe my downstream o2 sensor is not working and I just got a p0171 code on my 1999 4runner sr5. The idle is a little rough and the gas mileage went down alot. Should I replace both sensors? How to know if my car has a af sensor or o2 sensor? I cleaned my maf.

That seems like a cheaper way. Ithink I'm going to try that First , will let you know what happens. Ever had check engine light with p0171?

1999 4runner What should my a/f sensor ohm reading be? Mine is at 15 I have error code p0171, System lean The truck is running very rich.

I guess I'll have to switch it out. My o2s11 is reading. 640 volts My o2s12 is reading 0.000 volts and get it to 0.010-0.020volts on a 2500 rpm Rev. Is that normal?

The code is p0171 system too lean bank 1. Freeze frame Fuel system 1 status: cl Calculated load value: 20.4% Ect: 84c Short term fuel trim bank 1: 19.5% Long term fuel trim bank 1: 39.8% Rpm: 695/min Vehicle speed: 0mph Should I do a vacuum exhaust test?

Is there a way to tell without replacing it? Don't want to spend money and not be the issue.

Does the truck fall into a default mode if I unplug one of the sensors? If so I can eliminate which sensor is the bad one.

Is there a way to clean the sensors? Is there any tests to be done before just replacing the sensor and not know what it is?

When I put the rear o2 sensor back on I had to use a whole bunch of washers because the bolts where somewhat striped. Loud exhaust went away when I put o2 sensor back in its place, so I guess so. The front o2 sensor is otherwise known as af sensor? It was in its place should I take it out...

Codes Sorry I forgot to mention I did clear the code and it came back on.

Hello, I bought a 1999 4runner about 2 years ago. The truck ran great until about 6 months ago I went to mechanic to fix breaks and rotors. The mechanic ended up switching out both axles, 4 breaks and rotors, and he told me he welded up my muffler. about 4 months ago the muffler sounded really...

Hello, I bought a 1999 4runner about 2 years ago. The truck ran great until about 6 months ago I went to mechanic to fix breaks and rotors. The mechanic ended up switching out both axles, 4 breaks and rotors, and he told me he welded up my muffler. about 4 months ago the muffler sounded really...