P0160 code: O2 Sensor Circuit No Activity Detected (Bank 2, Sensor 2)
P0160 means o2 Sensor Circuit No Activity Detected (Bank 2, Sensor 2). The code says where to look, not what failed — the fix depends on which cause your car actually has.
What P0160 means
No activity means the computer sees a flat, unchanging signal from the bank 2 post-catalyst sensor — not high, not low, just silent, as if nothing were connected. That distinguishes P0160 from its stuck-low and stuck-high siblings (P0157, P0158) and usually points to a dead sensor, an unplugged or broken connector, or cut wiring. A failed heater circuit can also cause it: without its heater, a downstream sensor may never get hot enough to produce a usable signal, especially on short trips — a companion heater code such as P0161 is the giveaway. This code is also a classic follow-up to recent exhaust, transmission, or driveline work, where an underbody connector gets left unplugged or a harness gets pinched.
P0160 symptoms
- Check-engine light with normal driving behavior
- Failed emissions test or incomplete readiness monitors
- Often no other symptom at all
What it costs to fix P0160
Typical range: $80–$450 · about ~0.3–1.5 hrs of labor
| If the cause is… | Part | Labor |
|---|---|---|
| O2 sensor (Bank 2, Sensor 2) | $30–$200 | ~0.3–1 hrs |
| Wiring or connector repair | $5–$60 | ~0.5–1.5 hrs |
| Heater fuse replacement | $5–$15 | ~0.2–0.5 hrs |
The happy ending here is a reconnected plug or a fuse — nearly free. The typical ending is a sensor replacement. Budget uncertainty comes from wiring damage, which costs more in diagnosis time than in parts.
The price swings on which cause it turns out to be — so confirm the cause before paying. Diagnose P0160 for my exact vehicle →
How to fix P0160
Easy — basic tools, most owners can do this
- Think back to any recent work under the car
Exhaust, transmission, clutch, or driveshaft work is the classic lead-up to this code, because the bank 2 downstream connector is often unclipped to get parts out of the way. Get the vehicle safely on stands and confirm the connector is seated, latched, and not stretched taut against the pipe.
- Check for P0161 and how it behaves on longer drives
A heater code (P0161) or a blown heater fuse means the sensor may never get hot enough to produce a signal. A telling clue: if the bank 2 sensor 2 trace eventually stirs after a long highway run but stays dead on short trips, focus on the heater circuit before anything else.
- Confirm the flat line against bank 1 sensor 2
Graph both downstream sensors on a warm engine through a closed-throttle coast and a hard acceleration. Bank 1 sensor 2 should drop and recover; if bank 2 sensor 2 doesn't move at all, the computer truly isn't hearing it, as opposed to hearing a slow or biased sensor.
- Test the signal circuit end to end
Battery disconnected, check the signal wire and its ground from the sensor connector back to the engine computer for continuity, and flex the harness where it crosses the transmission or a crossmember while you measure. An open here, often from a pinched or stretched wire, produces exactly this silent signal.
- Replace the sensor once the circuit is proven
With heater power present and continuity confirmed, a sensor that still won't respond has failed internally. Install it with anti-seize, re-clip the lead clear of the exhaust, and drive enough for the catalyst monitor to run so it shows ready again.
DIY or shop? This one is usually solved by a home mechanic, and often for nothing more than the time it takes to reconnect a plug left loose after other work. The fuse check, the comparison graph, and a continuity test are all straightforward. Pay a shop if the open circuit is somewhere inside the harness that runs over the transmission, where reaching it may mean lowering parts, or if you can't safely raise the vehicle to get at the sensor.
Tools for the DIY steps: Jack and jack stands · Scan tool with live data · Digital multimeter · Fuse puller · O2 sensor socket
Not sure which step applies to your car? Get the likely cause for your exact vehicle before buying anything for P0160.
Start a case with P0160 and your car. Redline weighs these causes against what your car shows, and names the check that would settle it before you buy parts.
Can I drive with P0160?
Redline can’t determine from a symptom or code alone whether your car is safe to drive.
P0160: common questions
What is the first thing to check for P0160?
The connector. No-activity codes are the most likely of all O2 codes to be a simple unplugged or damaged connection, especially if anyone has recently worked under the vehicle. After that, check the heater fuse — a cold sensor produces no signal.
How is P0160 different from P0157 or P0158?
Those codes mean the sensor is talking but stuck at one extreme — low (lean) for P0157, high (rich) for P0158. P0160 means the signal is not moving at all, which shifts suspicion toward a dead sensor, disconnected wiring, or a heater that is not warming the sensor up.
Can a blown fuse really cause P0160?
It can. Oxygen sensors need to be hot to generate a signal, and the built-in heater gets them there. If the heater's fuse or circuit fails, the sensor can stay too cold to respond — often flagged by a heater code like P0161 alongside. A fuse is a much cheaper fix than a sensor, so check it first.
Will P0160 stop my car from passing inspection?
In OBD-tested areas, yes, twice over: the active code is a fail on its own, and without a working sensor the catalyst monitor for that bank cannot complete, which also blocks readiness. Fix it, then drive enough for the monitors to run before retesting.
Related trouble codes
Don’t have a scanner yet? A ~$25 Bluetooth adapter reads codes like P0160 from your phone. See our guide to the best OBD2 Bluetooth adapters. Run a repair shop? See Redline for shops.
Generic OBD-II reference. Manufacturer-specific behavior varies. Confirm with a scan tool and, for safety-related codes, a professional inspection. Cost ranges are reference ranges, not quotes.
Seeing P0160 on your car?
Every problem becomes a Case. Tell Redline what the car is doing: it shows what the evidence supports, what’s still missing, and what to check next, before you approve a repair.
“Inner pad ~1 mm. Outer pad 3 mm.”
Next: check the slide pins move freely before buying parts.