Question about Cars & Trucks
105000 miles on jeep wrangler sport. About a month ago same thing happened...switched gas staions (coincidence??) chk eng light went off. I did tighten gas cap before next fill up just incase but the light remained on at that time.
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
Here's a link to this great service
Posted on Jan 02, 2017
SOURCE: P0155 & P0135
O2 sensors are tricky. sometimes like anything else they fail. many times though the exhaust mixture they encounter is out of their range and that shows up as a failure.since you seem to have no other problems , I would go ahead and change them, but don't be disappointed if the code shows up again (at least you know it's not the sensors.) I don't like using the process of elimination when doing repairs but sometimes you must.
Posted on Mar 16, 2009
is this a 4 or 6 cylinder?
if a 4 cylinder it will only have 2 o2 sensors
V6 will have 4 o2 senors which the sensor will be the right side of the engine first sensor.
1st sensor on exhaust, I recommend if you change one change all, as this will make the computer when it rechecks the system you have all clean/fast responding sensors.
if you have a slow response it means the sensor is dirty and not reading well, which is usually caused by minor misfires that the engine computer dismisses, so a tune up would be recommended too.
Posted on May 06, 2009
I can see that you've done the right things, but something is still amiss... Mitsubishi says
A code P0421 may mean that one or more of the following has happened:
One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.
Posted on Sep 23, 2009
Those lights indicate an issue with ABS or traction control systems. In order to properly diagnose the problem the vehicle's codes will need to be read with a scanner.
Generally speaking there is no danger in driving the vehicle but be aware you may not have functioning traction control and/or ABS while those lights are present.
Posted on Feb 01, 2010
The connections to the sensor is heater voltage which is +12 volts supplied by external (from the ECM) wiring from the battery, and the 0 to + 5 volt self-generated signal from the O2 sensor is an input to the ECM. Suggest that you find another mechanic that isn't intent on selling parts. Also suspect is the quality of the replacement O2 sensor. It would take a major disaster within the ECM to make an input connection turn into an output and would likely damage the O2 sensor almost immediately--not a day later. Hope this helps!
Posted on Jul 19, 2010
Tips for a great answer:
Jun 07, 2018 | GMC Cars & Trucks
May 07, 2016 | Honda Cars & Trucks
Feb 15, 2014 | 2004 Jeep Wrangler
Sep 06, 2017 | 1995 Mazda Millenia
Jun 14, 2011 | 2000 Mitsubishi Eclipse
May 06, 2011 | 2001 Toyota Avalon
Apr 09, 2011 | 1997 Mazda Millenia
Dec 11, 2010 | 2004 Chevrolet Aveo
Generic OBD II Diagnostic Trouble Codes
DTC CODES P0200 to P0299
P0201....Injector Circuit - Cylinder 1
P0202....Injector Circuit - Cylinder 2
P0203....Injector Circuit - Cylinder 3
P0204....Injector Circuit - Cylinder 4
P0205....Injector Circuit - Cylinder 5
P0206....Injector Circuit - Cylinder 6
P0207....Injector Circuit - Cylinder 7
P0208....Injector Circuit - Cylinder 8
P0209....Injector Circuit - Cylinder 9
P0210....Injector Circuit - Cylinder 1
P0211....Injector Circuit - Cylinder 11
P0212....Injector Circuit - Cylinder 12
P0213....Cold Start Injector 1
P0214....Cold Start Injector 2
P0215....Engine Shutoff Solenoid
P0216....Injector/Injection Timing Control Circuit
P0217....Engine Coolant Over Temperature Condition
P0218....Transmission Fluid Over Temperature Condition
P0219....Engine Over Speed Condition
P0220....Throttle/Pedal Position Sensor/Switch 'B' Circuit
P0157....O2 Sensor Circuit Low Voltage (Bank 2 Sensor 2)
P0158....O2 Sensor Circuit High Voltage (Bank 2 Sensor 2)
P0159....O2 Sensor Circuit Slow Response (Bank 2 Sensor 2)
P0160....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
Nov 29, 2010 | 2005 Nissan Altima
Jan 09, 2010 | 2004 Jeep Wrangler
560 people viewed this question
Usually answered in minutes!