P2208
NOx Sensor Heater Sense Circuit (Bank 1)
- Severity
- Medium
- Driving
- Drive only to a garage
A fault in the NOx sensor heater sense circuit on bank 1. This is the feedback line the module uses to confirm the heater actually drew current when it was switched on.
Possible causes
- CommonFailed heater element inside the NOx sensor
- CommonCorroded connector at the sensor
- CommonWiring damaged by exhaust heat
- PossibleBlown fuse on the heater circuit
- PossibleWater reaching a hot sensor and cracking the element
- RareFailed control module driver
What you might notice
- Check engine light on
- Reduced power or limp mode
- Emissions system warning
- Restart countdown on some vehicles
- Failed emissions test
- Often no symptom the driver notices at first
What to check, in order
- Check the fuse for the heater circuit before anything else.
- Inspect the connector for corrosion and heat damage.
- Measure the heater element resistance against specification.
- Check the wiring where it runs along the exhaust.
- Note that the heater is usually integral to the sensor. If the element has failed, the sensor is the repair - so eliminate the wiring and fuse first, because the sensor is expensive.
Read this code from your own car
Plug an ELM327 adapter into the OBD-II port under the dashboard. Pin16 reads every stored, pending and permanent code, explains each one like this page does — offline, with no account — and shows what the car recorded when the fault was set.
Where this code sits
P00xxP01xxP02xxP03xxP04xxP05xxP06xxP07xxP08xxP09xxP0AxxP0BxxP0CxxP0DxxP0ExxP0FxxP10xxP11xxP12xxP13xxP14xxP15xxP16xxP17xxP18xxP19xxP1AxxP1BxxP1CxxP1DxxP1ExxP1FxxP20xxP21xxP22xxP23xxP24xxP25xxP26xxP27xxP28xxP29xxP2AxxP2BxxP2CxxP2DxxP2ExxP2FxxP30xxP31xxP32xxP33xxP34xxP35xxP36xxP37xxP38xxP39xxP3AxxP3BxxP3CxxP3DxxP3ExxP3Fxx
Fuel and air metering - injector circuits
P2200P2201P2202P2203P2204P2205P2206P2207P2208P2209P2210P2211P2212P2213P2214P2215P2216P2217P2218P2219P2220P2221P2222P2223P2224P2225P2226P2227P2228P2229P2230P2231P2232P2233P2234P2235P2236P2237P2238P2239P2240P2241P2242P2243P2244P2245P2246P2247P2248P2249P2250P2251P2252P2253P2254P2255P2256P2257P2258P2259P2260P2261P2262P2263P2264P2265P2266P2267P2268P2269P2270P2271P2272P2273P2274P2275P2276P2277P2278P2279P2280P2281P2282P2283P2284P2285P2286P2287P2288P2289P2290P2291P2292P2293P2294P2295P2296P2297P2298P2299