Replaced Up and DownStream O2 Sensors per P0130 engine lights and code stays on and remains the same

Hi Scotty Kilmer, thank you for all what you share it has helped me a long way. Just got this Mazda 3 2005 at 155000 this month, no history about it, by the looks of it, it has not been maintained bolt hard to loosen. Had put 92 gas in it and it didnt want to start at all or turn overover, nothingnothing but light engine radio heater did. Since it was a stick shift manage to jump it old skool.

I followed your video poured in a gallon of Lacquer thinner in on a half tank burnt it all out..

Code reads P0130 failed Emission test twice NOT READY...The following were done so far on it. New spark plugs all 4, oil change, replaced both down and upstream o2o2 sensors due to code P0130..replaced Thermostat and Sensor Tempature Contol. Starter, Alternator and battery tested at Auto Zone and all passed did not to replace any yeepiee.....Spent oveover 400 on parts and 0 on labor but code reads P0130 and Engine light on. On my 3rd diagnostic ugh....1st said there is a air leak either in the exhaust pipes or intake manifold must be replaced..2nd said He is confused so is goi g rethread spark plug #4 and now Im waiting for a call....

2 days ago I had use gas 86 or is it 87 and it started to yank or jerk while driving. Ive noticed that it is running more rough like it did before and very poor, heavy smell from the exhaust comicoming iin the car when windows down on acceleration, poor gas mileage burns more gas. RPMs go down when shiftishifting gears...

This is the only car I have now please help me!!!!

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Scotty Kilmer
Scotty Kilmer


This is all it can be, good luck. P0130 O2 Sensor Circuit Malfunction (Bank 1, Sensor 1) Article by Dale Toalston ASE Certified Technician OBD-II Trouble Code Technical Description O2 Sensor Circuit Malfunction (Bank 1 Sensor 1) What does that mean? This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles. Although generic, the specific repair steps may vary depending on make/model. The O2 sensor produces a voltage based on oxygen content in the exhaust. The voltage varies between .1 and .9 Volts, .1 indicating lean and .9 indicating rich. The ECM constantly monitors this voltage while in closed loop to determine how much fuel to inject. If the ECM determines that the O2 sensor voltage was too low (less than .4 Volts) for too long (for more than 20 seconds (time varies with model)), this code is set. Potential Symptoms Depending if the problem is intermittent or not, there may be no symptoms other than MIL (malfunction indicator lamp) illumination. If the problem is constant, then symptoms may include one or more of the following: MIL illumination Engine runs rough, missing or stumbling Blows black smoke from tail pipe Engine dies Poor fuel economy Causes Usually the cause of P0130 is a bad oxygen sensor, however this isn't always the case. If your o2 sensors haven't been replaced and they are old, it's a good bet that the sensor is the problem. But, It could be caused by any of the following: Water or corrosion in the connector Loose terminals in the connector Wiring burnt on exhaust components Open or short in the wiring due to rubbing on engine components Holes in exhaust allowing unmetered oxygen into exhaust system Unmetered vacuum leak at the engine Bad o2 sensor Bad PCM