V70 2004 won't start

[pjcat]

Got the tool and removed the ECM and TCM; cleaned them with MAF cleaner put them back inside and so far no problem. Starts like usual and no erratic behavior on the dash.
Cleared the P0037 error code, but it comes right back.
Thanks for the helpful advises, i hope it will stay like this.

[RickHaleParker]

Cleared the P0037 error code, but it comes right back.

Clean the connectors and check the wiring on the O2 Sensor.

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P0037 = ECM-2A20 Heated oxygen sensor (HO2S) bank 1, preheating. Signal too low

Diagnostic trouble code (DTC) information

Condition
The control module controls preheating by pulsing the current to the positive temperature coefficient (PTC) element in the heated oxygen sensor (HO2S). Pulse lengths are dependent on the temperature of the heated oxygen sensor (H02S).
Diagnostic trouble code (DTC) ECM-2A20 (bank 1) or ECM-2B20 (bank 2) is stored if the control module registers that the signal is higher than a particular value when preheating is activated (signal too high) or lower than a certain value when preheating is deactivated (signal too low or signal missing).

Substitute value
The fuel trim is shut off.

Possible source
Signal too high:

• Short-circuit to supply voltage in the signal cable
  Defective heated oxygen sensor (HO2S).

Signal too low:

• Short-circuit to ground in the signal cable
  Defective heated oxygen sensor (HO2S). [/color]

Signal missing:

• Contact resistance and oxidation
  Open-circuit in the power supply from the system relay
  Defective heated oxygen sensor (HO2S).

Fault symptoms
The malfunction indicator lamp (MIL) lights.

[veektor]

Got the tool and removed the ECM and TCM;

Initially I was on the fence about buying a special tool just for removing computer modules. "How often would I need this special tool" I had asked myself. Then I tried replacing the low-beam bulb on the passenger side, and was really glad I could just pop those modules out of the way.

[EngineeringBloke]

FYI, You get good access to the passenger bulbs if you remove the top then sides of the engine and AT computer module protective box. there are 3 or 4 releases near the base of the box.

(And I do have the module release tool.)

But I do consider the module release tool to be very useful anyway.