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Q: which is bank 1 O2sensor 1? I haven't looked yet
SEE Details on 1997 Toyota 4Runner

Check codes P0133 stated: #3 misfire & P0130 slow response O2sensor bank 1, sensor1.

I had spare Coils & wires from a 40K exchange engine from japan, installed @ 135k. (Rod failure x excess RPM)
so I pulled the plugs and changed them to new Bosch plat.4s. NOTE when I pulled #3 coil to pull the plug, the connector tip was burned and split. The plugs were new 5k ago (with eng. change) but the DENSO K16TR11 plug seal failed between the insulator and the hex body, the ceramic would move a 1/16" causing hot gases to leak burn up the tip of the coil on plug connector.

I changed all plugs, wires and coils: reset codes: runs good now.. will the code 130 come back?

?? Did this missfire condition cause the code P0130?
Did it damage the O2 sensor so that it forces me to change the O2 sensor or will it be ok.? or is it just better to change it, as it has some miles on it?
This cars just transportation, my fun car is a 69 Camero

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Hi Roy,
Oxygen sensors are identified by bank and sensor position. Sensor 1 is always pre catalytic converter, sensor two is always post catalytic converter. If an engine is a 4 or 6 cylinder engine the whole engine is considered bank 1, if an engine is a V6, V8, V10....., the engine bank containing cylinder number 1 (first cylinder in the firing order) is considered Bank 1, the other bank is considered Bank 2. Interpretation Oxygen sensor designation B2S1 refers to Bank 2 Sensor 1, it will be the sensor on the engine side of the catalytic converter in bank two. Check this link to determine the cylinder that contains cylinder number 1.
People over look valve clearance adjustment on Toyotas with shim adjusted valves, see that cause misfires. There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate
i think you are good. o2 could not respond quick enough with the engine miss, thus the code. no, it did not ruin the o2 sensor. keep driving it and see if the code returns. i think you are good to do.

Thanks, I think the fuel mileage should improve. are there any plug in tuners that may help? jerry

Is there more than 2 O2 sensors, before & after cat?

Thinking back is there any fuel additives that clean up the O2 sensor?
not really. for the expense of the add ons, it will offset the cost of gas. just keep up on the maintenance.

If you want to know if the upstream O2 sensor is working properly the find a tech with a scanner that can read serial data. I personally prefer a DSO(Digital storage osilliscope). The truth of the matter is O2 sensors wear out, just like spark plugs do. Here's some info on the P0130.

P0130 Heated Oxygen Sensor (Bank 1 Sensor 1) Circuit MalfunctionPossible Causes Setting Conditions
Check for air leaks in the Air Induction system (e.g., in the intake manifold)
Check for air leaks in the exhaust manifold and in the exhaust pipes
HO2S connector is damaged (check pins for damage, and for moisture)
HO2S signal circuit is open or shorted to ground
HO2S signal circuit is shorted to voltage
HO2S has failed (it may be contaminated with fuel, silicone or water)
PCM has failed
Engine running in Closed Loop; engine running at idle speed, and the PCM detected the Bank 1 Heated Oxygen Sensor 1 (HO2S 1/1) signal was fixed at 400 mv or higher, or that it was fixed at less than 550 mv.

This code sets in 2 Trip(s).
This code will turn on the MIL (Malfunction Indicator Lamp)
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