99 Sienna - P1130 P1133

[volvo4fun]

MD state emissions inspection is due and it won't pass with a check engine light on.
Bought an OBD scanner for $79, since the dealer wants $100 to read the code.

No symptons on the car as far as driving was concerned.

First go around: P0171 P1133 P1135
Did a reset and cleaned MAF sensor.

Within 10 miles the check engine light was on again:
P1130: A/F sensor circuit range / Perf (Bank 1 Sensor 1)
P1133: A/F sensor Ckt Response Malf. (Bank 1 Sensor 1)

What is broken here the MAF sensor or an O2 probe?

If it is the O2 probe which one is it and how to get access to it.

Thanks in advance.

[volvo4fun]

Anyone?

[mustang67408]

Originally Posted by volvo4fun

MD state emissions inspection is due and it won't pass with a check engine light on.
Bought an OBD scanner for $79, since the dealer wants $100 to read the code.

No symptons on the car as far as driving was concerned.

First go around: P0171 P1133 P1135
Did a reset and cleaned MAF sensor.

Within 10 miles the check engine light was on again:
P1130: A/F sensor circuit range / Perf (Bank 1 Sensor 1)
P1133: A/F sensor Ckt Response Malf. (Bank 1 Sensor 1)

What is broken here the MAF sensor or an O2 probe?

If it is the O2 probe which one is it and how to get access to it.

Thanks in advance.

P1133 A/F Sensor Circuit Response Malfunction
(Bank 1 Sensor 1) (Only for California Spec.)
This sensor is on the bank of cylinders nearest the firewall and is before the catalytic converter (closet to the exh manifold) B1S1
Its easiest to access from under the vehicle.

P1130 A/F Sensor Circuit Range/Performance Malfunction
(Only for California Spec.) This just confirms there is a problem in the A/F sensor. B1S1

P0171 You probably fixed this when you cleaned the MAF

[volvo4fun]

Problem fixed.

Bank 1 Sensor 1 is the sensor that is on the exhaust manifold between the firewall and the engine.

Repair Procedure:
Buy a OBDII code reader at NAPA or similar auto parts store, cheapest models are around $50;
Put the vehicle on ramps, apply parking brake, and any other customary safety measures;
Locate the sensor and cut off the wires at the sensor.
I am assuming you are on your back looking up at the sensor, feet pointing forward.
Take a 7/8 closed wrench in your left hand and manipulate through the opening on the left and check where you need to put and hold it to get access to the sensor;
Remove wrench;
Start engine and run it for 10 minutes, then shut off;
Crawl back underneath and position wrench, pull down on it.
You will only be able to turn it one flat so it takes a few minutes to get it out. Don't touch it because it will be very hot;
Screw the new one in and tighten it;

Ride the vehicle off the ramps;
Standing in front of the engine locate the Bank 2 Sensor 1, in between the radiator and the engine, find the connector;
Look at it and separate it so you can do this without looking at it, put it back together (I needed a flat blade screwdriver to unlock it);
Now lets go looking for the rear sensor!
Stick your right arm through the opening on the right side of the engine between the manifold and the engine on the throttle body side;
Try to find the connector with the 3 cut wires;
Disconnect the connector;
Take a long shoe strong and tie one end to the rubber in that general area, drop the rest down to the general area of the sensor;
Ride the vehicle up on the ramps (not over it);
Locate the end of the shoe string and tie it to the cable near the connector half of the sensor;
Ride the vehicle off the ramps;
Pull up on the shoe string;
Manipulate the two connectors halves and put them together (there is only place for one hand);
Take your OBDII scanner and reset the codes;
Run the engine and verify check engine light is off after the engine has reach operating temperature.

I am sure experienced mechanics can do a more efficient job, but for a weekend warrior this will work.

You may qualify for a Darwin Award if you mess up. So don't attempt to do this yourself if you cannot think through some of the steps that affect safety of yourself or anyone in your vicinity.


Robert