Questions tagged [o2-sensor]

Questions and discussions about oxygen (O2) sensors. Oxygen sensors are used to measure the exhaust gas concentration of oxygen for internal combustion engines in automobiles and other vehicles.

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77 views

Possible causes of rough idle after changing Oxygen sensor…?

Got a 2005 Acura TSX 2.4L that I changed the upsstream Oxygen(Air/Fuel ratio) sensor after the check engine light came on. Since than, the car has never run the same. Engine idles very poorly (...
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Engine feels like it will stall after Air/Fuel ratio sensor changed?

Got an 04 Acura TSX that's been baffling me for the couple of weeks. Accidentally bought an Upstream Oxygen sensor instead of the downstream so I thought might as well replace it since I have it (keep ...
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Changed AF sensor and O2 Sensor but Check Engine Light still on (P0138)

I recently had a CEL come up on my 2015 Corolla S CVT. It was code P0138 so with my mechanic's recommendation, I ended up changing both the AF sensor and the downstream O2 sensor with Denso OEM parts. ...
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Where are the O2 Sensors in a VW with 3 sensors?

My VW CC 2010 2.0L Sport CBFA has three oxygen sensors and two catalytic converters. The CCTA version has 2 oxygen sensors and one catalytic converter. Since the engine is in a transverse 4 ...
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AF/O2 and Fuel Trim data - Normal or not?

I'm learning to diagnose my car's poor gas mileage: Car: 2010 Toyota Matrix (Base). Engine: 1.8L, 4 cylinders, Auto, FWD. ODO: 103,000km (64,000 miles). City gas mileage: 12.6L/100km = 18.6 mpg (...
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Does anyone know the OEM for the 2006 Infiniti qx56 oxygen sensors

I've got the part numbers and some cross references for the 2006 Infiniti QX56 oxygen sensors, but I would like to buy from the OEM. Bosch? Denso? infiniti front left/right 226937S000 bosch 17204 5 ...
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64 views

Check engine light won't stay off

I've attempted to get my check engine light fixed a couple times and at each repair facility they've scanned the code and told me it was a bad oxygen sensor. I had the oxygen sensor replaced at both ...
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p0140 and p0172

I have a 2005 Elantra (205K miles). I replaced the second o2 sensor (downstream; after cat), added a defouler to second o2, replaced cylinder # 2 injector, air filter, tune-up. If the car is at idle ...
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1996 Infiniti g20 fails smog

I am the original owner of this CA car, and have been gradually having higher HC readings on smog checks. It failed in 2016, cleaned out the Air flow components; it passsed, but this increased the NO ...
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232 views

Variance - What is on the Vehicle and what the FSM states

2007 Honda Accord Manual Transmission DTC indicated: P1157 Usual remedy is to replace the oxygen sensor But I wanted to follow the diagnostic tree in the service manual until I discovered something ...
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O2 sensors located

need to know on a 2012 dodge caravan sxt v6 where are the o2 sensors located. Esp. upstream sensor 1 bank 1? Tried to look for them from above but no luck so far.
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153 views

2001 VW Beetle 02 sensor car will not go over 65mph

I have a 2001 VW Beetle 2.0 engine with 171,000 miles on it. I have a check engine light on saying that bank 1 lean. It has been like this for years and I have had no problem with it. Yesterday I ...
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89 views

Why do some applications show ignition signal in the O2 signal?

I had read somewhere that some cars show the ignition signal as interference in the oxygen sensor signal when viewed on a scope. It turns out my 98 Mazda 626 is one of those applications: The full ...
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Frequent Oxygen Sensor dirty problems (volvo diesel)

I have a volvo S60 diesel for 10 months (more than 30.000 Km), and I already have to clean the oxygen sensor once and seems that I have to clean it again. My question is what can I do to reduce the ...
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Need help fast with my truck please

My 1994 dodge Dakota v8 starts fine and ildes fine. If I drive for about 10m my engine light comes on and my code for the 02 sensor goes off. My truck is straight piped and has no cat it has a steel ...
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151 views

1991 Chevy Astro - O2 Sensor and Low Compression

I have a 91 Chevy Astro van with 15x,xxx miles. It idles very rough and drives extremely poorly at around 40mph, and, overall, seems to lack a bit of power. A compression test was performed on the ...
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65 views

Why have to concentrate on exhaust gas instead of inlet mixture in Indian Bikes for emission control [closed]

I am having Apache RTR 180 (carburetor version) . Having a question towards Bharat Stage (BS) (Emission Norms) against bikes. Recently went through BS specification. To achieve this, we are going ...
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Oxygen Sensor Engine Light

I had Oxygen Sensor Engine Light that complained about the Bank 1 Sensor 1. I used my OBD2 tool to clear the code, and the engine light is not coming back. Can I leave the sensor as is or still I ...
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Can faulty O2 sensor cause omission check engine light?

I have had a check engine on a 2001 Subaru Legacy for some time now. Went to mechanic to fix few other things and he told me the oxygen sensor and catalytic converter needs to be replaced. The ...
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Faulty O2 sensor identification

The car is a 2006 BMW 325i (N52B25 engine). The problem started out as a performance issue (car didn't pull quite that hard), after a while it turned into more serious issues like low rpm stuttering/...
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500 views

Car hesitating while accelerating at low speeds and check engine light is on constantly. Why? [closed]

2001 Subaru Forester hesitating while accelerating at low speeds and check engine light is constantly on.
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Can you mix black oil caued by poor air fuel ration with new oi?

Every time I used to drain and add oil it would quickly turn black. That was most probably because i've been driving with a faulty o2 sensor and apparently the air fuel ration due to this is one ...
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131 views

1996 dodge dakota 4 cylinder 5 speed

Bought a new upper o2 sensor but the clip on wiring harness is melted so I want to straightwire them to o2 sensor. Harness wires... black, tan, gray, green with orange stripe Oxygen sensor... black,...
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Location of O2 sensor on 1990 Toyota pickup

I'm trying to locate the O2 sensor on my 1990 RWD 22R 2.4 Toyota pickup truck. I've looked all over underneath the car by the driver's side seat. There is no O2 sensor on top of the exhaust pipe, ...
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157 views

2003 toyota sequioa oxygen sensor upstream color code diagram

2003 toyota sequia 4wd engine side the harness connector ripped, i need the color code.Engine side the wires are green with red stripe, green with white stripe, black, white I dont know how to rewire ...
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318 views

O2 sensor location for 1990 pickup 4x4 3.0L

I'm trying to locate the oxygen sensor on my 1990 Toyota pickup SR5 4x4 w/3.0L. I bought the truck from a kid who had the knock sensor wire rigged into the harness plug for the o2. I fixed the knock ...
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637 views

2002 Honda CRV Suddenly Throwing Multiple Codes and then a Dead Battery

Last night the CEL came on, and I got the codes read on the way home. P0122: Throttle Position sensor "A" circuit low voltage P0139: Secondary HO2S12 (heated oxygen sensor - bank 1 sensor 2) circuit ...
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2k views

Where is the engine temperature sensor located on a Mazda 323?

2003 Mazda 323 Astina, 1.8l, I am trying to figure where the engine temperature sensor is located in the car. How can I tell if it's faulty? I am only guessing it is because the car overheats, the ...
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AFR vs incorrect Lambda sensor?

re: 2007 Subaru 3.0 LL Bean 6 cylinder I'm chasing negative long term fuel trims and knock but my car had the pre-cat exhaust sensors replaced at a local shop couple of years back which are marked ...
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54 views

Coolant vs. air fuel ratio or O2 sensor

If there's a trace of coolant getting into the cylinder combustion chamber what would the effect be on the AFR or O2 sensors fitted to the exhaust pipe? I'm guessing zirconium sensors would read rich ...
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20 views

02 sensor electrical connectot

I have a 2013 Chevy malibu and I am replacing the o2 sensor but my problem is disconnecting the electrical connector. I pulled the white clip up and tried disconnecting but it doesn't work. I dont ...
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25 views

2012 Toyota Prius O2 Bank 1 Sensor 2

I recently received a P0138 code for my 2012 Toyota Prius. My diagnostic tool says its the "O2 Sensor circuit Hight voltage Bank 1 Sensor 2". Is this the same as the "downstream" I keep hearing? ...
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35 views

What are best steps to diagnose a bucking engine/

My 1992 Nissan with SR20DE (2.0 liter 143 HP o2 and MAF equipped OBD I engine, 16 valve, fuel injected), bucks. I own this car for ten years now and a lot has been replaced. Not always in attempt to ...
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49 views

O2 sensor not connected

Just change manifold on an 2002 Hyundai santa fe. One of the o2 sensor is not hook up. The car start ed drive around corner car act like it was choking and stop. Now car wont start up
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104 views

Loss of Power and increased engine knock in my 2011 Ford Ranger Truck. Bad Gas or Bad Oxygen Sensor?

This past summer I've been noticing that my truck is not making the same power as it used too and I've noticed a pronounced increase in engine knock (detonation). The detonation usually occurs when I ...
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233 views

O2 Sensor Voltage Output

I have an Acura legend (1995) that I did a header swap on and replaced the o2 sensors. They aren’t connected as of now and the car is running rich because of it. If I wanted to trick the car into ...
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767 views

Check engine light on for O2 sensor (Oxygen) but O2 sensor has been replaced

Someone told me it could be a minor leak somewhere but the check engine light does indicate the above on Mazda 626,year 2000. Could the code be misleading?

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