The second coolant temperature sensor, usually in the radiator outlet, is reading implausibly. Often accompanies thermostat faults.
P2183 — also written P2183, P 2183, 2183 — is the OBD-II code for engine coolant temperature sensor 2 circuit range/performance. Same code, same fix: this page covers every spelling of it.
P2183 is a sensors fault code, typically costing £80–£400 to put right in a UK garage.
What causes P2183?
- Failed second ECT sensor
- Stuck thermostat
- Air lock in the cooling system
- Wiring fault
How P2183 is fixed
- Compare both coolant sensors on live data
- Bleed the cooling system properly
- Replace the thermostat or sensor
P2183 repair cost in the UK
Most P2183 repairs land between £80–£400 including parts and labour. The spread is wide because the cheap fix (a sensor, a hose, a leak) and the expensive fix (a major component) throw the same code — which is why a proper diagnosis before parts are bought saves the most money.
Can you drive with P2183?
Yes, but keep an eye on the temperature gauge.
Urgency: medium.
What P2183 is telling you
The ECU runs continuous plausibility checks against what a good engine should be doing. When a reading strays outside that model for long enough, this code is stored and the light comes on.
On P2183 specifically — engine coolant temperature sensor 2 circuit range/performance — the stored code records the moment that check failed, not the moment the part gave up. That gap is why two cars with the same code can need completely different repairs.
How P2183 is diagnosed properly
Each of the known causes is ruled in or out in cost order, cheapest and most likely first. On P2183 that means working through them like this:
- Failed second ECT sensor — compared against live data and a known-good reference before it is condemned — a sensor reading the wrong thing accurately is a different fault from a dead one.
- Stuck thermostat — confirmed with live data before any part is bought.
- Air lock in the cooling system — confirmed with live data before any part is bought.
- Wiring fault — checked with the loom flexed and the engine warm, because a wiring fault that is intermittent when cold shows itself under heat and vibration.
An hour of diagnostic time on P2183 routinely saves more than it costs, because the alternative is buying the most expensive part on that list and hoping.
The repairs that actually clear P2183
- Compare both coolant sensors on live data
- Bleed the cooling system properly
- Replace the thermostat or sensor
After the repair the code is cleared and the car is driven until the relevant readiness monitor completes, rather than handed back as soon as the light goes out. A code that has only been erased will come straight back on the next drive cycle.
What happens if P2183 is ignored
It is drivable in the short term. Left for months, though, the secondary damage is what costs money, and the original cheap cause is still there underneath it.
For reference, P2183 typically lands at £80–£400 all-in at an independent garage in the UK — main-dealer quotes for the same job usually sit above that.
Getting P2183 looked at
Bob's Mechanical Repairs is an independent garage in Birnam, Dunkeld, Perthshire, with 32 years of Bob's experience on the tools. If P2183 is showing on your car, bring the scan results with you — we will read the live data ourselves, tell you which of the causes above it actually is, and price the repair before any work starts.