Question about 1993 Saturn SL2

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OBD II Code

Code P1133
HO2S Bank 1 Sen 1 Insuff. Switching
What is this telling me?

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It is telling you the fuel system is not seeing any closed loop switching, the signal from an O2 always varies between rich and lean, back and forth, you can have 3 things going on, one the O2 is lazy or has failed, but most times that would trip a lean code, the more likely cause is a problem in the fuel control, either to rich or to lean. without the actual voltage readings from the O2 it is hard to tell you what to replace, do you have a system monitor tool?

Posted on Aug 31, 2008

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2 Answers

P1133/oxegen sensor


MAKE SURE THE CONNECTIONS AT THE SENSOR ARE GOOD,ALSO CHECK FOR VACUUM LEAKS,HERE'S A LINK TO YOUR CODE,THE OLD SENSOR MAY BE GOOD,JUST A VACUUM LEAK, P1133 Chevrolet HO2S Insufficient Switching Bank 1 Sensor 1

Oct 17, 2015 | 2002 Isuzu Rodeo Sport S 3.2L V6 Hard Top

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Check engine light is on and i got error code p1133. what is that?


Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1
- Vacuum leak
- Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 harness is open or shorted
- Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 circuit poor electrical connection

The Powertrain Control Module (PCM) monitors the Heated Oxygen Sensor (HO2S) activity for 90 seconds after closed loop operation has begun. The PCM determines if the front HO2S is functioning properly by counting the number of HO2S-1 Lean/Rich (L/R) and Rich/Lean (R/L) switches.

If the Powertrain Control Module (PCM) determines that the front HO2S did not switch enough times, the PCM will set the P1133 code.

replace the o2 sensor

Dec 14, 2013 | 2006 Saturn Vue 2.2

1 Answer

Engine light code p1133 on a 2005 chevy colorado


P1133 CHEVROLET - HO2S Insufficient Switching Bank 1 Sensor 1xicon.jpghttp://engine-codes.com/p1133_chevrolet.htmlForum CodePossible causes- Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 shorted to Engine Control Module (ECM) ground
- Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1
- Vacuum leak
- Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 connector and wires

Jun 24, 2012 | Chevrolet Colorado Cars & Trucks

2 Answers

I have a 2000 chevy suburban with codes p1133 and p0131 what is the pooblem


P1133 indicates heated oxygen sensor insufficient switching bank #1 sensor #1. P0131 indicates voltage from that sensor is staying low more than 2 minutes. That sensor could be bad or it could indicate a rich condition.

May 10, 2011 | Chevrolet Suburban 1500 Cars & Trucks

1 Answer

Code p1133


According to blueextc3221 this is:
GM p1133 = Heated Oxygen Sensor (HO2S) Insufficient Switching Bank 1 Sensor 1
more than likely you have a bad oxygen sensor...the primary oxygen sensor in the exhaust BEFORE the catalytic converter.

GL,
Td

Jul 06, 2010 | 1997 Buick Century

1 Answer

The car wont start it tries but no luck the code is p1133


Trouble Code: P1133 (3.4L V6 VIN E Auto)
HO2S-11 (Bank 1 Sensor 1) Insufficient Switching Print this code dataprint_icon_codes.gif Number of Trips to Set Code: 2
OBD II Monitor Type: CCM Details
Indicators: MIL Details
Trouble Code Conditions:
DTC P0105-P0108, P0112-P0118, P0122, P0123, P0171, P0201-P0204, P0300-P0304, P0335, P0440-P0446, P0506, P0507, P0601, P0602 and P1441 are not set, engine speed from 1600-2450, ECT sensor over 158ºF, TP angle from 9-18%, Purge command over 36%, Purge Learn Memory over 0.86, fuel level over 10%, and the PCM detected the HO2S signal voltage switched from rich-lean or lean-rich less than 20 times in a 100 ms monitoring period.

Possible Causes:
  • Air leaks present in the exhaust manifold or the exhaust pipes
  • Fuel pressure is too high (i.e., causing a rich air fuel mixture)
  • HO2S may be contaminated (due to improper fuel or silicone)
  • HO2S signal high or low reference circuit has high resistance
  • HO2S heater element has failed, or the heater circuit is open
  • PCM has failed

Oct 15, 2009 | 2003 Oldsmobile Alero

1 Answer

1998 GMC Sonoma threw code P1133 02S 1/1


P1133 - Heated Oxygen Sensor (HO2S) Insufficient Switching Bank 1 Sensor 1
I would have the repair shop see if they either damaged or left disconnected the oxygen sensor for engine cylinder bank one upstream sensor, this sensor would have been disconnected if the oil pan was removed.

Apr 20, 2009 | 1998 GMC Sonoma

3 Answers

Codes 1133-0131-0171-0300


p1133 - o2 sensor, Insufficiant Switching, Bank 1 Sensor 1.
p0131 - o2 sensor circuit, low voltage, bank 1 sensor 1
p0171 - Lean condition, Bank 1
p0300 - Random Misfire

I would be looking at the front passenger side oxygen sensor for issues. It may be bad, it may not be plugged in, bad wiring at harness.

The random misfire may be symptomatic of the o2 sensor problem.

Mar 17, 2009 | 2002 Chevrolet Silverado 1500

1 Answer

Diagnostic codes 97 tahoe 4d 4wd 5.7


p1460 cooling fan circuit,p1153 ho2s insufficient switching bank 2 sensor 1,p1133 insuf. swit. sen. 1 or bank 1 sen. 1,p420 catalyst system efficiency below threshold bank 1,p152 o2sen. circuit high volt. bank 2 sen.1

Feb 24, 2009 | 1997 Chevrolet Tahoe

1 Answer

Code: P1133


P1133 - Heated Oxygen Sensor (HO2S) Insufficient Switching Bank 1 Sensor
You will need to check the output signal from this O2 sensor, if the voltage low (.10-.25 volts) try spraying propane into the air cleaner to see if the O2 volts go up, it should go to around .75 volts, if nothing happens then the O2 sensor is bad, bank #1 O2 is on the same side as #1 cylinder
PLEASE RATE THIS INFO.

Nov 25, 2008 | 2005 Chevrolet Silverado

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