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Discussion Starter · #1 ·
Hi all,

Replaced the Cat with some downpipes.
But i the proccess one sensor got damaged.

This is the error i'm getting

P0051
Ho2S Heater Control Circuit low (bank 2 Sensor 1)

We replaced top left sensor but keep getting the error.
My question which one is it then?

Thank a lot!
 

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GTR Nerd
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5,335 Posts
If the code is correct, and you replaced that sensor, then check the wiring. Did you pinch a wire somewhere?

Product Font Auto part Rectangle Parallel


P0051
Air fuel ratio (A/F) sensor
1 heater (bank 2) control
circuit low
The current amperage in the A/F sensor 1 heater
circuit is out of the normal range.
(An excessively low voltage signal is sent to ECM
through the A/F sensor 1 heater.)
• Harness or connectors
(The A/F sensor 1 heater circuit is
open or shorted.)
• A/F sensor 1 heater
 

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Discussion Starter · #3 ·
Hi Sean,

thanks for the answer and diagram.
Is there a way to measure the wiring, to see it got pinched or broken somewhere?

Thanks a lot
 

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GTR Nerd
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1.CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection M95. Refer to Ground Inspection in GI-41, "Circuit Inspection".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace ground connection.
2.CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
1. Disconnect air fuel ratio (A/F) sensor 1 harness connector.
2. Turn ignition switch ON.
3. Check the voltage between A/F sensor 1 harness connector and ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 3.
3.DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E3, F1
• IPDM E/R harness connector E7
• 15A fuse (No. 46)
• Harness for open or short between A/F sensor 1 and fuse
>> Repair or replace harness or connectors.
 

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GTR Nerd
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5,335 Posts
4.CHECK A/F SENSOR 1 HEATER OUTPUT SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between A/F sensor 1 harness connector and ECM harness connector.
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
5.CHECK A/F SENSOR 1 HEATER
Refer to EC-171, "Component Inspection (GT-R certified NISSAN dealer)".
Is the inspection result normal?
YES >> GO TO 7.
NO >> GO TO 6.
6.REPLACE AIR FUEL RATIO (A/F) SENSOR 1
Replace malfunctioning air fuel ratio (A/F) sensor 1. Rectangle Font Material property Parallel Number
 

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GTR Nerd
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1.CHECK AIR FUEL RATIO (A/F) SENSOR 1
1. Turn ignition switch OFF.
2. Disconnect A/F sensor 1 harness connector.
3. Check resistance between A/F sensor 1 terminals as follows.

Terminal Resistance
3 and 4 1.98 - 2.66 Ω [at 25°C (77°F)]
3 and 1, 2 ∞ Ω
4 and 1, 2 (Continuity should not exist)

Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 2.
2.REPLACE AIR FUEL RATIO (A/F) SENSOR 1
Replace malfunctioning air fuel ratio (A/F) sensor 1.
CAUTION:
• Discard any air fuel ratio (A/F) sensor which has been dropped from a height of more than 0.5 m
(19.7 in) onto a hard surface such as a concrete floor; use a new one.
• Before installing new air fuel ratio (A/F) sensor, clean exhaust system threads using Heated Oxygen
Sensor Thread Cleaner [commercial service tool (J-43897-18 or J-43897-12)] and approved anti-seize
lubricant (commercial service tool).
 

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Im having this issue. Problem is i have no clue how to diagnose like above. My 02 harness is obviously not getting power after replacing the sensor itself. My car basically thinks that its unplugged even though it is not.

Anyone have any insight or pointers ? Is a dealership the best bet. Please help

02 codes p1168 & p0051 (bank 2) already replaced with denso replacements because I thought thats what the deal was.
 
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