Nissan M 45 B196F Engine Trouble Code
What is Nissan M 45 B196F?
Nissan M 45 B196F indicates potential catalytic converter failure. If completely failed, your vehicle may not run properly and fuel economy will suffer significantly. Average replacement cost is $2,000–$2,140. This repair requires professional service and should not be delayed.
B196F on the Nissan M 45
The Nissan M 45 features a sequential multi-port fuel injection (SMFI) system where injector timing is tightly synchronised with the crankshaft signal. Wear on the crankshaft reluctor ring teeth produces signal dropout events that accumulate and eventually trigger B196F.
Code Information
| Code Type: | OBD-II Body (B) Trouble Code |
| System: | Body |
| Vehicle: | Nissan M 45 |
| Brand: | Nissan |
| Model: | M 45 |
| Code: | B196F |
B196F Nissan M 45 Symptoms
Check Engine Light
Illuminated Nissan M 45 dashboard warning
Engine Stalling
Engine stops unexpectedly or misfires
Performance Issues
Reduced power or acceleration on the Nissan M 45
Starting Problems
Difficulty starting the engine
Poor Fuel Economy
Increased fuel consumption on the Nissan M 45
Increased Emissions
Failed emissions test due to B196F
B196F Code Structure
Understanding what each digit means in the B196F body trouble code:
| B | 1 | 9 | 6 | f |
|---|---|---|---|---|
| Body Code | Fuel And Air Metering | Injector Circuit Malfunction - Cylinders | Cylinder 4 Contribution/Balance Fault | System Malfunction |
How to Fix Nissan M 45 B196F
Diagnostic Steps:
The catalytic converter has oxygen sensors before and after it. When warm and in closed-loop mode, the upstream O2 sensor reading should fluctuate, while downstream should remain steady.
Repair Solution:
VSS concerns may stem from noisy input signals caused by RFI/EMI from ignition wires, charging circuits, or aftermarket equipment. Verify VSS reads 0 mph when transmission is in Park.
Technical Notes:
B196F DTC specifically relates to camshaft timing. When cam timing is over-retarded, the check-engine light illuminates and this code sets. Verify VCT solenoid operation and check for contamination.
Nissan M 45 B196F Repair Cost
VVT actuator replacement on the Nissan M 45 for B196F is a more significant investment: $400–$700 including the oil flush required before fitting the new actuator. Using the correct low-SAPS engine oil after the repair is critical to prevent premature re-failure.
B196F Description
B196F engine trouble code is related to System Malfunction.
Main Cause
The primary reason for B196F OBD-II Engine Trouble Code is: Injector Circuit Malfunction - Cylinders.
Common B196F Misdiagnosis on the Nissan M 45
On the Nissan M 45, the VANOS (variable camshaft timing) solenoid is routinely replaced for B196F when the actual issue is oil pressure insufficiency. No solenoid will operate correctly if the oil pressure required to actuate the VVT phaser is not present.
DIY Repair Guide: B196F on Nissan M 45
After any repair that involved disconnecting the battery on the Nissan M 45, the power window, steering angle sensor, and transmission adaptive values all require a reset drive cycle. Skipping this can cause false fault codes — including B196F — for the first two to three start cycles.
Preventing B196F on the Nissan M 45
The Nissan M 45 heat shield over the exhaust manifold protects the nearby sensor wiring from radiant heat damage. Inspect it for cracks or displacement at every brake service. A $15 replacement shield can prevent $300+ wiring loom repairs.
Frequently Asked Questions — Nissan M 45 B196F
A: Yes. A weak battery causes voltage drop during cranking that confuses the ECU and can store a range of fault codes. Always rule out battery and charging system health before diagnosing sensor-related codes.