Question about 1998 Toyota Tacoma

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Bank 1 sensor malfuncatoin/lean fuel/slow to react

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  • Toyota Master
  • 20,706 Answers

What engine, no engine size stated so i must generalize. (hard)
you got a CEL then pulled the DTC, bravo that.. well done!@
B1S1 or B1S2, posting the actual DTC wins here,
any other DTC'S or running symptoms?????????????????????
my guess is B1S1 , due to lean lookup. bank 1 sensor 1.
S1 is the keystone of engine fueling (at idle or steady cruise) .
It determines the final air and fuel air mixtures.

the sensor can be bad.?
or any cracks in the exhaust near it.????? (fresh air is 20% oxy)
or engine really is lean.
see , 2 logic reasons, sensor bad or good and is lean for real.

if car has 100k on it, its due, for a change, anywhy
so do that.
then if it comes back, then it real (no cracks)
why is my engine really real.
its lean for a large number of possible reasons...
1: low fuel pressure.
2: MAF stuck high, or if MAP car, map reading to high.
in simple English the air sensors are fibbing showing Low air when it really air.
the air sensors. are the prime sensors.
all fuel is injected based on them. (and temperatures)

3: air leaks, on MAP cars, it dont go lean only races.
3b: air leaks on MAF , causes lean conditions, (most modes)
on a maf based engine any induction leaks too big will cause
the B1S1 sensor to loose control at idle or low speed cruise,Hot)

there are other reasons.. many.
the above is basics.
let it be said, the engine that misfires, sends a slug of oxygen
to the sensors. and causes it to mess up.
this is the bad deal with all narrow band oxy sensors...
they dont see misfire. correctly.


what we do in a shop is see if we can wake up the sensor
(no cracks found in header)
(S1 is the PRE CAT sensor , one more way to say it)
we force the EFI rich, and scan and graph the S1.
how? , well there are 2 ways.
1: is add propane gas to the induction, (air cleaner works)
2: or force fuel pressure higher, on MAF cars, we pinch the vacuum
'hose to the Fuel pressure reg, this makes it go about 10psi higher.
now you know a trick. or two.
the o2 will go rich showing that it is alive. if not , its dead.
or has horrid levels of oxygen flowing by it.
(gross misfire, burned exhaust valves, gross induction air leaks., etc)




Posted on Dec 25, 2013

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Posted on Jan 02, 2017

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SOURCE: CHECK ENGINE LIGHT CAME ON P0171 FUEL TRIM BANK1 SYSTEM TO LEAN.

Hi. You need to clean the Mass Air Flow Sensor.
This is an easy job.
Get a can of throttle body or brake cleaner spray at your local auto parts store.

Open the hood, and locate the air filter box. follow the tube from the filter box towards the engine. Look for a small black box with 2 screws holding it to the air tube, Remove the wire connector and observe inside the sensor with a flashlight. You will see 2 small wires, and they will appear fuzzy or dirty. Spray the interior with the cleaner until the wires are nice and clean. Do not use compressed air, you will damage the sensor. Put it all back together and drive it.
This will def fix your issue. This is a vey common problem. If you do it yourself, you will save 70 + bucks.

Thanks for choosing FixYa, and a FIxYa rating for my assistance would be greatly appreciated.

Posted on Jan 23, 2009

  • 30 Answers

SOURCE: code p1130 p0171

P0171- mens the MAF sensor is dirty and needs cleaned. You can get MAF cleaner at your local auto parts store. The MAF is located in the air intake just after the air filter
P1130- is more than likely a result of the previous code. It is in regard to the feul/air mixture ratio. A dirty MAF can cause this code.
Also, if you are using an aftermarket oiled air filter, it would be the cause of the P0171 code.

Posted on Aug 08, 2009

superjorge1
  • 8 Answers

SOURCE: have p0130 and p0133 codes 98 toyota tacoma

check the mass air flow sensor there maybe dirt on the filiment inside the sensor causing false readings. cleaning or replacing it may make the codes go away.

Posted on Nov 18, 2009

  • 3640 Answers

SOURCE: how to change a fuel bank sensor #1 code p1135 on

P1135 Air/Fuel Sensor Heater Circuit Response. (Bank 1 Sensor 1) ask any auto parts store what the fix is.

Posted on May 17, 2010

SOURCE: air fuel sensor heater circuit

air fuel sensor heater circuit response malfuction

Posted on Oct 09, 2010

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My 2004 Honda CRV showing code P0133 and P0171


  • P0133 O2 Sensor Circuit Slow Response (Bank 1 Sensor 1)
  • P0171 System Too Lean (Bank 1)
Hi Michael, After fixing errors you need to reset your computer by disconnecting the battery for a minute or two, Also you'll need your radio code to reset your radio, I hope this helped...........CHEERS..

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Cylinder misfire spark


how many miles on the odometer, mines 95k.
ah a v6, P0306 is #6 misfiring. 2.5L V6
300 is all 6 misfiring.... oops.
it is. for sure.
misfire is cause by many things, only 3 in physics, but many real world. (compression + spark +fuel rates)
i works this easy, way.
i have a full scan tool not just a code reader (near useless it)
i make sure my V6 (I have an 04) holds closed loop at idle and 2500 rpm. i f not , fix that first.
easy, it is. just look, bingo, Open loop, (out of control)
fueling is out of control.
but, first i do that tune up. in the manual, 60k , 120k, 180k, see?
do that first. , spark plugs dont last foreever nor filters.
then i replace both front 02 sensors at 100k miles. there design life.
V6 has 2 front sensors. (rear can , just sit and be ignored)
if it misfires. now, i toss a coin.
compression or fuel pressure.
i can do both in 30min flat but i toss coin lands on fuel.
i check fuel pressure and its.
60psi, fuel regulator is bad,
20psi, same, or bad pump or bad 12vdc to pump, 8v to pump is bad wiring.
one thing that helps is to find out if the engine is running too rich or too lean.
and if there are cracks in the exhuast near the 02 sensors.
i force the EFI rich and lean watching both 02 sensors in my scan tool
to see if i can force them lean or rich.
on the v6, we can introduce air leaks, to the plenum.
this will cause lean, and the o2 most react to my lean forcing
or its dead.
i can force richer, if i suspect lean or 02 shows lean, by
removing the Fuel pump regulator hose (vac) and plugging hose fast.
this causes the FPreg to go to high pressure. max.
causing RICH>
i watch the 02 and see it go rich, if not the 02 is bad or you have exhaust leaks, or dead cylinder causing the 02 to fib.
you have 2 banks, and both banks are running off 1 MAF
so you can look at both 02 sensors (front) B1S1 and B1S2
and see if both react the same. to my forcing's.

i dont think you have 3 bad cops out 6. no.
if any cylinder misfires on bank one, then bank 1 o2 goes nuts
same with the Bank 2. this can aid troubleshooting having 2 banks.
the MAF can not lie for 1 cyclinder nor one bank
the 02s can lie for each bank,
both are key to diagnosis.
let me give an example say
injector 1 leaks.
causing 301s
v6
246
135 left
this is your lay out.
my guess is its not lost compression (no test guess, mostly useless)
not 2 bad cops one on each side will cause 300s
not one bad cop. as other side would be ok.
not one bad injector.
my guess, is fuel pressure is way off.
but///???
or maf running lean (dirty, spary clean it 12inches away not close)
low fuel pressure
too high fuel pressure.

all comments are for engine with 60k mile service done,
60k, 12ok, etc.



Jan 13, 2014 | 2002 Suzuki Grand Vitara

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2002 suzuki truck code p0133


oxygen sensor, bank 1 sensor 1, is SLOW.
That means the part the reads oxy, is slow to react.
there are only 2 causes.
1: the sensor is slow, replace it , for as slow as $20
2: or you have complex fueling issues.
is this the only code stored, or any pending codes?
has your fuel mileage reduced?
this sensor only lasts for 100k, are you over that?

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O4 sebring, PO175, PO174 codes?


Sounds like a problem with one of the O2 sensors.
Code 174 is bank two being too lean, and 175 is bank two being too rich. The computer tries to keep the fuel mixture switching back and forth between rich and lean. If the sensor is "lazy" the computer will make the mixture too rich or lean trying to get the sensor to react.
A mechanic can watch the sensor performance with a scanner to see what they are doing. You have two sensors on each bank.

Apr 06, 2013 | Cars & Trucks

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Error codes po 134 po 153 po 154 po 155 po 171 po 174


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PO 153 =02 SENSOR CIRCUIT SLOW RESPONSE (BANK 2 SENSOR 1)
PO 154 =02 SENSOR CIRCUIT NO ACTIVITY DETECTED (BANK 2 SENSOR 1)
PO 155= 02 SENSOR HEATER CIRCUIT MALFUNCTION (BANK 2 SENSOR 1)
PO 171= SYSTEM TOO LEAN (BANK 1)
PO 174= SYSTEM TOO LEAN (BANK 2)
I WOULD SAY YOU HAVE FAULTY OXYGEN SENSORS CAUSING THE ENGINE TO RUN TOO LEAN REPLACE THEM AND YOU SHOULD BE BACK IN BUISNESS

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1 Answer

What do the codes 1128, 1129, 1133, and 1134 mean on my Porsche Boxter 2001?


code P1128 02 sensor bank 1 lean
code P1129 02 sensor bank 1 lean to limit
code P1133 02 sensor bank 2 lean
code P1134 02 sensor bank 2 lean to limit

fuel system is lean.

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Hur byter jag växellädsolja på


160....O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 2)

P0161....O2 Sensor Heater Circuit (Bank 2 Sensor 2)

P0162....O2 Sensor Circuit Malfunction (Bank 2 Sensor 3)

P0163....O2 Sensor Circuit Low Voltage (Bank 2 Sensor 3)

P0164....O2 Sensor Circuit High Voltage (Bank 2 Sensor 3)

P0165....O2 Sensor Circuit Slow Response (Bank 2 Sensor 3)

P0166....O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 3)

P0167....O2 Sensor Heater Circuit (Bank 2 Sensor 3)

P0168....Fuel Temperature Too High

P0169....Incorrect Fuel Composition

P0170....Fuel Trim (Bank 1)

P0171....System too Lean (Bank 1)

P0172....System too Rich (Bank 1)

P0173....Fuel Trim Malfunction (Bank 2)

P0174....System too Lean (Bank 2)

P0175....System too Rich (Bank 2)

P0176....Fuel Composition Sensor Circuit

P0177....Fuel Composition Sensor Circuit Range/Performance

P0178....Fuel Composition Sensor Circuit Low Input

P0179....Fuel Composition Sensor Circuit High Input

P0180....Fuel Temperature Sensor A Circuit

P0181....Fuel Temperature Sensor A Circuit Range/Performance

P0182....Fuel Temperature Sensor A Circuit Low Input

P0183....Fuel Temperature Sensor A Circuit High Input

P0184....Fuel Temperature Sensor A Circuit Intermittent

P0185....Fuel Temperature Sensor B Circuit

P0186....Fuel Temperature Sensor B Circuit Range/Performance

P0187....Fuel Temperature Sensor B Circuit Low Input

P0188....Fuel Temperature Sensor B Circuit High Input

P0189....Fuel Temperature Sensor B Circuit Intermittent

P0190....Fuel Rail Pressure Sensor Circuit

P0191....Fuel Rail Pressure Sensor Circuit Range/Performance

P0192....Fuel Rail Pressure Sensor Circuit Low In put

P0193....Fuel Rail Pressure Sensor Circuit High Input

P0194....Fuel Rail Pressure Sensor Circuit Intermittent

P0195....Engine Oil Temperature Sensor

P0196....Engine Oil Temperature Sensor Range/Performance

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1 Answer

02 kia fail smog high nox


if the engine computer says that you have a slow O2 sensor what it means is that the sensor does not react as quickly as it should and it needs to be replaced. nox is oxides of nitrogen, a product of too lean combustion which causes cylinder temps to go too high. it sounds like replacing O2 sensor will make it happy. engine computer is having a hard time controlling lean/ rich fuel mix because sensor is slow to register changes, needs to have response time in milliseconds or engine computer can't operate properly. O2 sensors do wear out, normal service item. hope that helps

Jun 17, 2009 | 2002 Kia Optima

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