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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138 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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6answers
18k views

Can an O2 sensor cause faulty spark plugs on driver side only when the spark plugs were just changed?

I took my truck (2006 chevy silverado 5.3l v8) to chevrolet dealership due to the fact that it kept sputtering then dying. The check engine light was on the whole 9 yards. The fuel pump has been ...
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1answer
44 views

2007 Honda Fit Sport P0420

I backed up in a dirt lot and heard a metal scraping sound. After driving about 30 miles, the check-engine light came on with code P0420 indicating "Catalyst Efficiency Below Threshold (Bank 1)&...
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1answer
16 views

O2 Sensor Bad Voltage Reading? 2013 Toyota Corolla

I'm Looking at the o2 sensor data for my 2013 Corolla and don't know if B1S2 is bad or not. I've heard that o2 sensors in general should oscillate between 0 and 1 V but I've also heard that for newer ...
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1answer
46 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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1answer
106 views

Test 3 wire NTK, Bosch O2 sensor signal after heat up, but, not signal. Why?

I have a 1996 Nissan Altima O2 + Catalytic converter not ready. I want make sure O2 sensor really work. Upstream sensor (before CAT) work by measuring voltage when heated up with torch. Downstream ...
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0answers
40 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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4answers
91k views

How do I resolve error code P1135 in my Toyota Camry?

I recently replaced the downstream O2 sensor in my Toyota Camry. Shortly thereafter, the check engine like came on again providing the following codes: P1135 which I understand to be the upstream ...
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0answers
34 views

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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2answers
10k views

Rough idle @ stoplights - O2 sensors reading zero voltage

I have an '05 4.7L Dodge Dakota that has had an issue with rough idle for over a year now. It seems to only happen after coming to a stop at a traffic light. It seems to happen more often after having ...
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2answers
925 views

2006 Hyundai Sonata GLS emissions fail

I own a 2006 Hyundai Sonata GLS 3.3L v6 and recently gave it for some repair work after which the car failed emissions test.The shop told me that the oxygen sensor and Catalyst Monitor are not ready ...
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1answer
86 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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2answers
4k views

What can cause slow oxygen sensor readings?

I have very slow primary (pre-cat) oxygen sensor readings on my 02' Corolla (2ZZ-GE, 141kW N/A). While trying to investigate the issue, I repeated diagnostics frequently. Before every diagnostic ...
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3answers
31k views

Can a car operate without a catalytic converter?

So I was reading this Quora question which answers in the affirmative, but here's my misgiving: I was under the impression that the oxygen sensor which the ECU uses to adjust the fuel-to-air ratio, is ...
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2answers
23 views

What is the standard size thread for O2 (lambda) sensors?

I may be purchasing aftermarket headers for one of my projects. Most of the options I care to look at do not have O2 sensor bungs welded in them, so I'd have to purchase some and weld them in so the ...
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0answers
11 views

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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1answer
39 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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1answer
40 views

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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5answers
222 views

O2 sensor replacement

I'm leaving on a 800 mile trip tomorrow and check engine light came on. Took it to autozone and computer said it was the o2 sensor. Is this something that should be replaced prior to the trip or can ...
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0answers
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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1answer
25 views

Is LambdaB1S1 the same as Upstream O2?

I have an Innova 3040C scan tool and a 2013 Hyundai Accent. Under live data I have O2B1S2 which I believe is the downstream O2 sensor. Oddly there is no O2S1B1 listed. There is a LambdaB1S1 voltage ...
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1answer
3k views

O2 Sensor Error after replacing spark plugs?

Ford Taurus 2004 Sedan SES DOHC. (The car is actually in the shop right now and I told him to hold off until I get more info.) Took the car to the local shop to get the spark plugs replaced. Because ...
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0answers
51 views

Are my cats bad? — secondary O2 sensor voltage

I have a 2002 BMW M3, and I've been trying to track down a poor fuel economy issue for quite some time now. My long term fuel trims are high (+7%-10%), and when I had the car on the dyno a couple ...
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0answers
19 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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3answers
5k views

Can a check engine light reset itself when a scan tool is connected?

I have a Toyota RAV4 2002 4WD. I was driving to the car wash when suddenly the check engine light come on when I accelerated hard. After the wash, it still was on. I drove home, shut it off, turn it ...
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1answer
109 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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0answers
34 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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1answer
67 views

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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2answers
104 views

Engine lean issues

Vehicle is a 2006 Ford Courier, started having hesitation/loss of power after fill up at a gas station that I'd never been to before. I depend on it for transport so I'm forced to still drive it, ...
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5answers
4k views

Gas pedal floored yet the car can't reach maximum speed

I'm running a manual Opel Corsa 2005 Sedan (engine code: C16SE, 1600cc). The problem I'm encountering is that the car won't reach its maximum speed of 200km/h as similar cars do. Instead, it stops ...
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0answers
134 views

o2 sensor readings don't make sense to me

I get these readings as showed in the graph below from both o2 sensors and I am having a hard time to interpret them, especially sensor 2 (downstream). The readings are from a short drive around town (...
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3answers
77 views

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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0answers
47 views

2001 Camry P1135 Cause

Sorry in advance for the long post. My check engine light in my 2001 Camry 4cyl recently came on with code P1135. Google shows that this is usually a faulty sensor. However, I noticed on some posts ...
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0answers
130 views

Reoccuring Check Engine Light (P0135 (Oxygen Sensor Heater) - 2000 Toyota Camry V6

Here is the situation: I have a 2000 Toyota Camry V6 (not California model) with a reoccurring check engine light. The code is P0135 - Heated Oxygen Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)...
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3answers
11k views

P0420 in a Prius

EDIT #2: I rescanned, looking at the correct data, and found the rear O2 sensor was definitely bouncing up and down with the forward sensor's lambda reading. Since I have looked for leaks and couldn'...
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0answers
25 views

Bmw N52N Lambda probes madness

Owner of a BMW E60 523i LCI Automatic (N52N engine. aka N52k). 105000 Kms on the clock. The error codes below after deletion, re-appear after 300~400 Kms. It is theoritically impossible for 4 lambda ...
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2answers
6k views

How do I repair the O2 sensor in a 2001 Toyota Camry?

I have a 2001 Toyota Camry and the O2 sensor near the front of the car is bad (this is confirmed by the code that the computer has returned). Though I'm not particularly knowledgable about cars (...
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0answers
11 views

1993 Eagle Vision o2 sensors

We have a 1993 Eagle Vision, 150k miles. We need to get current tags, but the car will not pass emissions. We have changed out spark plugs and wires, oil change, air filter, gas cap, misc other.... ...
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3answers
38k views

Do engines absolutely need an O2 sensor to function properly?

My understanding is that the O2 sensor's main goal is to get the fuel mixture as close as possible to the stoichiometric ratio of 14.7:1 so that the catalytic converter can function at its peak. But ...
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0answers
9 views

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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1answer
37k views

How long will my motor last having clogged catalytic converters?

My catalytic converters have been clogged for awhile, and the o2 sensors need changed because of this. What is it doing to my engine? And gas mileage for that matter? If i take out my ...
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2answers
65 views

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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0answers
83 views

Does an oxygen sensor's lambda value represent the same when running on LPG?

I have converted my car to LPG, and i've been tuning it today with a wideband lambda controller. It runs pretty okay, but i'm not yet satisfied. The weird thing is, it accelerated best when the ...
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1answer
102 views

My new Oxygen Sensor package does not include copper anti-seize

My new Oxygen Sensor package does not include copper anti-seize. I know that is is a good practice, and most S2 sensors come with an anti-seize paste. I have this anti-seize that I use for my brake. ...
2
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1answer
311 views

Difference between banks for AFR & O2 sensor values

This is a well maintained 2007 Subaru with 140k km on the 3.0 litre six cylinder EZ30R engine. She's running a little scratchy most noticeable when cruising although no codes or anything. I decided ...
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1answer
438 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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2answers
1k views

Replaced catalytic converter, O2 sensor went out, Replaced it and check engine light is still on

About a month ago I replaced my catalytic converter, a few weeks later the O2 sensor went out. I replaced that too and I'm still getting a check engine light code for the same sensor. What else should ...
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4answers
975 views

Is it possible for an oxygen sensor spacer to cause a car to stall?

VW CC 2010 2.0L CBFA I installed an O2 sensor spacer on my downstream O2 sensor and it seemed to be working for a day. One day later, after the car had cooled down it would rough idle and stall when i ...
9
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4answers
44k views

How to Unscrew/loosen stuck O2 sensor

I have been trying to unscrew my faulty O2 sensor (to replace it with a new one I purchased) in a 2001 Honda Accord, with a F23A4 engine, per the following instructions: http://www.amazon.com/review/...
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0answers
63 views

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 ...